Carlston

The best way to improve the ride is to use tyres with more sidewall height such as 195/65R15 and 205/55R16 instead of 225/45R17 and 225/40R18...rather than fitting springs that are too soft. Notice below, that the increased ride height springs are slightly stiffer than the standard ride height springs (ie. 0.25mm thicker wire diameter). This is to help compensate for the car's increased centre of gravity and associated tendency to roll more in corners. FRONT SPRINGS (for Octavia MK3 1.6TDI DSG estate FWD) Standard ride height front springs 5Q0411105GK Length 315mm Wire diameter 12.00mm Increased ride height front springs 5Q0411105HN Length 332mm Wire diameter 12.25mm REAR SPRINGS (for Octavia MK3 1.6TDI DSG estate FWD) Standard ride height rear springs 5Q0511121AD Length 348mm Wire diameter 10.75mm Increased ride height rear springs 5Q0511121BD Length 361mm Wire diameter 11.00mm Some increased ride height front springs (matching 5Q0411105HN) Kilen 23132 KYB RA1122 Lesjofors 4085733 https://www.autodoc.co.uk/car-parts/oem/5q0411105hn?supplier%5B%5D=246&supplier%5B%5D=85&supplier%5B%5D=253 Some increased ride height rear springs (matching 5Q0511121BD) Kilen 63141 KYB RA7155 Lesjofors 4285742 https://www.autodoc.co.uk/car-parts/oem/5q0511121bd?supplier%5B%5D=253&supplier%5B%5D=85&supplier%5B%5D=246

Octavia MK3 1.4TSI 150PS hatchback FWD gknautomotive lists 5Q0511121AD as the standard ride height rear spring without towbar gknautomotive lists 5Q0511121AF as the standard ride height rear spring with towbar Octavia MK3 rear springs (1JA=standard ride height) (0N1 = Standard rear axle) 1 5Q0511121AA Coil spring 2 PR:1JA+0YA 1 5Q0511121AB Coil spring 2 PR:1JA+0YB 1 5Q0511121AC Coil spring 2 PR:1JA+0YC 1 5Q0511121AD Coil spring 2 PR:1JA+0YD 1 5Q0511121AE Coil spring 2 PR:1JA+0YE 1 5Q0511121AF Coil spring 2 PR:1JA+0YF 1 5Q0511121AG Coil spring 2 PR:1JA+0YG 1 5Q0511121AH Coil spring 2 PR:1JA+0YH 1 5Q0511121AJ Coil spring 2 PR:1JA+0YJ https://www.lllparts.co.uk/catalogs/skoda/CZ/OCT/753/5 5Q0511121AF rear springs Sachs 994 923 https://www.autodoc.co.uk/car-parts/oem/5q0511121af?supplier%5B%5D=32

5Q0513029KF rear shock absorbers are listed against build codes 1JE+1X0+K8D (for vehicles manufactured after 05.10.2015). When searching for aftermarket rear shock absorbers, it's better to search for the earlier 5Q0513029KF OEM part number rather than the later 5Q0513029RR OEM part number...because the listings for most aftermarket rear shock absorbers that might be suitable haven't been updated to the later OEM part number. Bear in mind, that most aftermarket rear shock absorbers are sold to replace a huge range of OEM part numbers...so may not be a close match to the original Skoda parts. For example, KYB 3448024 is sold to replace rear shock absorbers with lowered ride height, standard ride height, and increased ride height, ie. a one size fits all approach.

5Q0513029KD rear shock absorbers are listed against build codes 0N4+1JC+1X0+K8D (and manufactured after 05.10.2015) VW Codes Decoder 0N4 independent rear suspension 1JC lowered ride height 1X0 front wheel drive K8D estate Octavia MK3 parts catalog https://www.lllparts.co.uk/catalogs/skoda/CZ/OCT/753/5/511/511001

One of the standard wheel sizes on the Octavia MK2 1.9TDI 105PS is 195/65R15 6Jx15 ET47 5/112 57.1 Steel rims can be ordered on their own or with fitted and balanced tyres, from mytyres.co.uk Alcar 9165 6Jx15 ET47 5/112 57.1 steel rim (7.73kg) (Octavia MK2) https://www.mytyres.co.uk/rims/details?vehicleId=183006013861926000&rimCode=ALCAR9165 Alcar 9165 6Jx15 ET47 5/112 57.1 steel rim with fitted and balanced Uniroyal RainExpert 5 195/65R15 91H (Euro label C A 71dB) https://www.mytyres.co.uk/cw/bundle?vehicle_ids=182669563303826544&wheelId=SKWi-9165--D-124258&rimCode=ALCAR9165&tyreId=D-124258&wheelIdWithTpms=&season=so&rimType=steel Octavia MK2 parts catalogue https://www.lllparts.co.uk/catalogs/skoda/CZ/OCT/419/6

The 57A093860B and 57A093860C kits on "skoda eshop cz" both list a 125/70R18 3.5Jx18 ET25.5 spare wheel with OEM part number 5E3601011B, as shown below. 57A093860B (for Karoq FWD) Sada pro výměnu rezervního kola 18Určeno pro: Karoq.Technical specificationProduct code 57A093860B Color Black Material Polystyrene Set contents Polystyrene box, plastic nut, mounting bolt with rosette, luggage compartment floor support, jack, jack handle, wheel wrench, assembly instructions. Weight 3 kg Limitations Only for 4x2 front-wheel drive vehicles with basic luggage compartment floor and standard rear seats as standard equipment. Fastening On the luggage compartment floor. Spare wheel (product code) 5E3601011B (3.5J x 18" ET 25.5) 57A093860C (for Karoq 4x4) Sada pro výměnu rezervního kola 18Určeno pro: KaroqTechnical specificationProduct code 57A093860C Color Black Material Polystyrene Set contents Polystyrene box left, polystyrene box right, polystyrene spacer, plastic nuts, fixing screw with rosette, luggage compartment floor support, luggage compartment carpet, jack, jack handle, wheel wrench, assembly instructions. Weight 8.2 kg Limitations Only for 4x4 vehicles with basic luggage compartment floor and standard rear seats as standard equipment. Fastening On the luggage compartment floor. Spare wheel (product code) 5E3601011B (3.5J x 18" ET 25.5)

On the Octavia MK3, the 253mm rear brake discs come in two widths (51.6mm and 61.4mm). Confusingly, both rear brake discs use the same build code, ie. 1KD. The 253mm rear brake discs with a 61.4mm width appear in the Octavia MK3 parts catalogue from the 2018 model year...so when the car was facelifted. What size brake discs are fitted usually depends on what engine is fitted, in particular the engine power. Occasionally, the size of brake discs can also depend on whether the car is FWD or 4x4, and whether it's a petrol or diesel. From various autodoc listings (Jurid, Ferodo, Pagid, Champion), it appears that the Octavia MK3 uses 253x10mm rear brake discs for all models with up to 150PS. 253x10mm rear brake disc (D=51.6mm) (up to 2017 model year) https://www.autodoc.co.uk/ate/956867 253x10mm rear brake disc (D=61.4mm) (2018 model year onwards) https://www.autodoc.co.uk/ate/18101448 ATE Rear Brake Discs (Octavia MK3) 253x10mm ATE 24011002771 (pre-facelift model) 253x10mm ATE 24011004201 (facelift model) 272x10mm ATE 24011003561 310x22mm ATE 24012202191

The price on the Australian version of Amazon for this SKF front wheel bearing seems similar to the price in the UK, even taking into account shipping. SKF VKBA 7011 (sold to replace 8V0498625A) https://www.amazon.com.au/SKF-VKBA-7011-Wheel-bearing/dp/B019IPPN7C/ref=sr_1_1

The 2014 Octavia MK3 2.0TSI 220PS VRS has 340x30mm front brake discs, ie. build code 1LG. Therefore, the front wheel bearings have OEM part number 8V0498625A...as shown in the Octavia MK3 parts catalogue. Front wheel bearing (Octavia MK3 with 312x25mm or 340x30mm front brake discs) 9 8V0498625A Front wheel bearing with assembly parts 85mm Octavia MK3 parts catalogue https://www.lllparts.co.uk/catalogs/skoda/CZ/OCT/753/4/407/407005

One option is to change the 205/55R16 to 205/60R16 or 205/65R16...assuming the current spare wheel is 205/55R16 6.5Jx16 ET46. 205/60R16 and 205/65R16 have an outside diameter much closer to the standard Superb MK3 tyre sizes, as shown in the chart below. Another option is to use a 215/60R16 fitted to a 6Jx16 ET43 rim (from the Karoq FWD). Unlike the standard 16" wheel, ie. 215/60R16 6.5Jx16 ET41, a 215/60R16 6Jx16 ET43 wheel fits in the spare wheel well without lifting the carpet. Superb MK3 tyre sizes 205/55R16 631.9mm (not a standard Superb MK3 tyre size) 205/60R16 652.4mm (not a standard Superb MK3 tyre size) 205/65R16 672.9mm (not a standard Superb MK3 tyre size) 215/60R16 664.4mm 215/55R17 668.3mm 235/45R18 668.7mm 235/40R19 670.6mm MWD 16236 6Jx16 ET43 5/112 57.1 steel rim (from Karoq) https://www.mytyres.co.uk/rims/details?vehicleId=1128135213981897840&rimCode=MWD16236

Skoda sell two "foam and jack" kits for the Karoq. One is for the Karoq FWD, and the other is for the Karoq 4x4. The "foam and jack" kit includes everything, except for the actual spare wheel...which can be ordered separately. These "foam and jack" kits can be ordered from any VAG parts department, by quoting the relevant OEM part number, ie. 57A093860B for the Karoq FWD or 57A093860C for the Karoq 4x4. The standard space saver wheel for both of these kits is 125/70R18 3.5Jx18 ET25.5 5/112 57.1 which are often sold secondhand on ebay from about £40...sometimes unused. However, 125/70R18 has an outside diameter about 5% smaller than standard Karoq wheels...so perhaps consider 135/80R18 instead of 125/70R18 fitted to the same 3.5Jx18 ET25.5 5/112 57.1 steel space saver rim. When fitted to a 3.5J rim, the 135/80R18 tyre is about 7mm wider than the 125/70R18 tyre...so check that there's 7mm of available space in the wheel well (when a 125/70R18 3.5Jx18 wheel is in the spare wheel well) before ordering a 135/80R18 tyre. The actual width of a tyre is measured when the tyre is inflated from sidewall to sidewall, at the widest point. It might also be worth seeing if a standard full-size wheel fits in the spare wheel well...such as 215/60R16 6Jx16 ET43 5/112 57.1 (for the Karoq FWD) or 225/60R16 6Jx16 ET43 5/112 57.1 (for the Karoq 4x4). 135/80R18 space saver tyre https://www.camskill.co.uk/m129b0s7672p0/Temporary_Spare_Tyres_-_Space_Saver_Tyres_-_18_inch_R18_inch_-_135_80_18_135_80R18_R18_inch_-_135_18_135R18 Karoq FWD "foam and jack" kit 57A093860B (Czech price about £90) Only for 4x2 front-wheel drive vehicles with basic luggage compartment floor and standard rear seats as standard equipment Karoq 4x4 "foam and jack" kit 57A093860C (Czech price about £128) Only for 4x4 vehicles with basic luggage compartment floor and standard rear seats as standard equipment

1K2614019B Right Hand Drive F >> 1Z-62173 092* F >> 1Z-68069 679* https://www.autodoc.co.uk/ate/13668740 1K2614019H Right Hand Drive F 1Z-62173 093>>* F 1Z-68069 680>>* https://www.autodoc.co.uk/ate/13765809#brake-master-cylinder Octavia MK2 parts catalogue https://www.lllparts.co.uk/catalogs/skoda/CZ/OCT/419/6/611/611010

2017 Yeti 1.4TSI 4x4 150PS Rear brake discs 272x10mm 1KS 1K0615601AA 5Q0615601D Rear brake pads 272x10mm 1KS 5K0698451 5K0698451A 5K0698451C 5K0698451D

312x25mm front brakes (build code 1ZA) (TRW brake system) (Octavia MK3) Left front brake caliper 8V0615123A https://www.autodoc.co.uk/trw/7488968 Right front brake caliper 8V0615124A https://www.autodoc.co.uk/trw/7488969 Left front brake caliper carrier 8V0615125A https://www.autodoc.co.uk/trw/7488924 Right front brake caliper carrier 8V0615126A https://www.autodoc.co.uk/trw/7488925 Octavia MK3 parts catalogue https://www.lllparts.co.uk/catalogs/skoda/CZ/OCT/753/6/615/615025

Outside diameter of standard 225 tyre sizes (Octavia MK3, not Scout) 225/35R19 640.1mm 225/40R18 637.2mm 225/45R17 634.3mm Outside diameter of 235/40R18 compared to the standard 225 tyre sizes 235/40R18 645.2mm (0.8% bigger outside diameter compared to 225/35R19) 235/40R18 645.2mm (1.3% bigger outside diameter compared to 225/40R18) 235/40R18 645.2mm (1.7% bigger outside diameter compared to 225/45R17) Outside diameter of 235/35R19 compared to the standard 225 tyre sizes 235/35R19 647.1mm (1.1% bigger outside diameter compared to 225/35R19) 235/35R19 647.1mm (1.6% bigger outside diameter compared to 225/40R18) 235/35R19 647.1mm (2.0% bigger outside diameter compared to 225/45R17) Outside diameter of 225/40R19 compared to the standard 225 tyre sizes 225/40R19 662.6mm (3.5% bigger outside diameter compared to 225/35R19) 225/40R19 662.6mm (4.0% bigger outside diameter compared to 225/40R18) 225/40R19 662.6mm (4.5% bigger outside diameter compared to 225/45R17) Outside diameter of 235/40R19 compared to the standard 225 tyre sizes 235/40R19 670.6mm (4.8% bigger outside diameter compared to 225/35R19) 235/40R19 670.6mm (5.2% bigger outside diameter compared to 225/40R18) 235/40R19 670.6mm (5.7% bigger outside diameter compared to 225/45R17) ETRTO approved rim widths for passenger car tyresa 225/45 7.0-7.5-8.5 225/40 7.5-8.0-9.0 225/35 7.5-8.0-9.0 235/45 7.5-8.0-9.0 235/40 8.0-8.5-9.5 235/35 8.0-8.5-9.5

You can open an account on "skoda parts com" and park your Skoda in the garage with its VIN number. This apparently lets you get the OEM part numbers of various parts free of charge. "skoda parts com" https://www.skoda-parts.com/online-store.html

The part number of the turbo actuator for the Skoda Rapid 1.0TSI might be 04E198725G. This OEM part number is also listed for the 1.0TSI engine used in some other Skodas including the Fabia MK3, Kamiq, Karoq, Octavia MK3, and Scala...so it's not just used for the 1.0TSI engine in the Rapid. The listings on autodoc show that this part is out so stock, but it's listed in stock on "skoda parts com"...as linked to below. Skoda Rapid parts catalogue https://www.lllparts.co.uk/catalogs/skoda/CZ/RAP/740/1/145/145020 04E198725G https://www.autodoc.co.uk/car-parts/oem/04e198725g?search=OEN+04E198725G 04E198725G https://www.skoda-parts.com/spare-part/04e198725g-turbo-pressure-vacuum-regulator-europen-union-oe-producer-54360.html

The only Skoda approved 17" tyre size for the Karoq FWD (Front Wheel Drive) NOT 4x4 is 215/55R17. 205/55R17 isn't a Skoda approved tyre size for the Karoq. Also note that 205/55R17 has a smaller outside diameter than 215/55R17. Skoda cars that use the 205/55R17 tyre size include the Kamiq and Octavia MK4. Outside diameter of tyres 205/55R17 657.3mm (1.6% smaller outside diameter compared to 215/55R17) 215/55R17 668.3mm

If you have steel rims and fit snow chains, the owner's manual says remove the wheel trims before fitting snow chains. So as removing wheel trims from steel rims isn't a modification, I would have thought that removing wheel trims from alloy rims would also not be a modification.

The below three ALTAIR alloy rims are listed in the "Skoda alloy rim accessory catalogue". 7.5Jx19 ET48 5/112 57.1 alloy rims ALTAIR 5E3071499AA FL8 5E3071499AB HA7 5E3071499AC 8Z8 Colour code decoder FL8 Black HA7 Anthracite 8Z8 Silver The OEM part number format xxx601xxx means the alloy rims are factory alloy rims or from the standard Skoda parts catalogue. The OEM part number format xxx071xxx means the alloy rims are from the "Skoda alloy rim accessory catalogue". Alloy rims from the "Skoda alloy rim accessory catalogue" might be about 60% less expensive than alloy rims from the standard Skoda parts catalogue because Skoda use the "Skoda alloy rim accessory catalogue" to compete on price with aftermarket alloy rims. The only difference is the OEM part number and sometimes the colour can also be different (if the three-digit colour code is different). The three-digit colour code should be cast into the back of the alloy rim.

As you can see in the two charts below, if the Octavia MK2 was manufactured before 06.03.2006 build codes 1JA+0YD meant the car came with 1K0511115BF rear springs, but if the Octavia MK2 was manufactured from 06.03.2006 the same build codes meant the car came with 1K0511115BD rear springs. So what Skoda did from 06.03.2006, was start fitting the cars with rear springs that were two down in the hierarchy, ie. softer rear springs. If the owner of a later car (manufactured from 06.03.2006) fits stiffer rear springs two up in the hierarchy, they are simply going back to what Skoda used to fit until 05.03.2006. Octavia MK2 rear springs (car manufactured until 05.03.2006) (1JA=standard ride height) 1K0511115BC 1JA+0YA 1K0511115BD 1JA+0YB 1K0511115BE 1JA+0YC 1K0511115BF 1JA+0YD 1K0511115BG 1JA+0YE 1K0511115BH 1JA+0YF 1K0511115DE 1JA+0YG 1K0511115DF 1JA+0YH 1K0511115BL 1JA+0YJ 1K0511115BM 1JA+0YK 1K0511115BN 1JA+0YL 1K0511115BP 1JA+0YM Octavia MK2 rear springs (car manufactured from 06.03.2006) (1JA=standard ride height) 1K0511115FT 1JA+0YA 1K0511115GA 1JA+0YB 1K0511115BC 1JA+0YC 1K0511115BD 1JA+0YD 1K0511115BE 1JA+0YE 1K0511115BF 1JA+0YF 1K0511115BG 1JA+0YG 1K0511115BH 1JA+0YH 1K0511115DE 1JA+0YJ 1K0511115DF 1JA+0YK 1K0511115BL 1JA+0YL 1K0511115BM 1JA+0YM As you can see in the chart below, the aftermarket spring market has a lot of rebranding going on, ie. the same spring is often sold under more than one brand name. Some springs that should match 1K0511115BF (this isn't a complete list) Ashika ZCA7099A (same as KYB RA7099) Bilstein 36-134076 (might be rebranded) JapanParts ZC7099A (same as KYB RA7099) Japko ZCJ7099A (same as KYB RA7099) Kilen 63117 (same as Lesjofors 4285718) KYB RA7099 (same as NAPA NCS1219) Lesjofors 4285718 (same as Kilen 63117) NAPA NCS1219 (same as KYB RA7099) Sachs 996 653 (same as SKF VKDL 31011) SKF VKDL 31011 (same as Sachs 996 653)

NAPA NCS1219 appears to be a rebranded KYB RA7099, so identical to that spring. It should be almost identical to the Sachs rear spring that is sold to replace 1K0511115BF. The KYB RA7099 is sold to replace 1K0511115BE and 1K0511115BF, but is probably a 1K0511115BF rear spring because KYB couldn't sell a 1K0511115BE rear spring to replace a 1K0511115BF rear spring due to a 1K0511115BE rear spring not being able to support the same axle weight as a 1K0511115BF rear spring. One white paint mark and one yellow paint mark is a 1K0511115BD rear spring. NAPA NCS1219 rear springs (probably matches 1K0511115BF) (£31.48 for two) Length 353mm Wire diameter 11.75mm Number of coil turns 8 (as shown in the below KYB RA7099) https://www.ebay.co.uk/itm/195003151427 When looking for stiffer rear springs for the Octavia MK2 with standard ride height, I first get a list of all of the standard ride height rear springs that are shown in the Octavia MK2 parts catalogue, as shown below. As you can see below, there are twelve rear springs in this hierarchy going from the softest rear spring (1K0511115FT) to the stiffest rear spring (1K0511115BM). The first two springs in this hierarchy aren't listed for the estate or 4x4 versions, only the hatchback version. 1K0511115BD is 4/12 in this hierarchy, and 1K0511115BF is 6/12 in this hierarchy. Next, I get the specifications for the original spring (that is too soft) and the next two in the hierarchy. Getting a good idea of the specification can often be difficult because different brands will often have different ideas of what the specification of each spring is, and many brands don't give the specification. Octavia MK2 rear springs (car manufactured until 05.03.2006) (1JA=standard ride height) 1K0511115BC 1JA+0YA 1K0511115BD 1JA+0YB 1K0511115BE 1JA+0YC 1K0511115BF 1JA+0YD 1K0511115BG 1JA+0YE 1K0511115BH 1JA+0YF 1K0511115DE 1JA+0YG 1K0511115DF 1JA+0YH 1K0511115BL 1JA+0YJ 1K0511115BM 1JA+0YK 1K0511115BN 1JA+0YL 1K0511115BP 1JA+0YM https://www.lllparts.co.uk/catalogs/skoda/CZ/OCT/419/5 Octavia MK2 rear springs (car manufactured from 06.03.2006) (1JA=standard ride height) 1K0511115FT 1JA+0YA 1K0511115GA 1JA+0YB 1K0511115BC 1JA+0YC 1K0511115BD 1JA+0YD 1K0511115BE 1JA+0YE 1K0511115BF 1JA+0YF 1K0511115BG 1JA+0YG 1K0511115BH 1JA+0YH 1K0511115DE 1JA+0YJ 1K0511115DF 1JA+0YK 1K0511115BL 1JA+0YL 1K0511115BM 1JA+0YM https://www.lllparts.co.uk/catalogs/skoda/CZ/OCT/663/5

All Superb MK3 models use the same 312x25mm front brake discs with TRW front brake calipers, except for the 272PS/280PS 4x4 models that use the bigger 340x30mm front brake discs. You can use any of the below three OEM part numbers because they all lead to the same aftermarket front brake pads. Brembo brake pads often don't do well in tests. ATE, TRW, Ferodo, Jurid, etc. are generally better. EBC DPX2150 are another good front brake pad which are available on ebay for about £60. However, TRW GDB1956 are available for about £33 including shipping to the UK on the German version of Amazon. OEM part numbers for front brake pads (312x25mm front brake discs) (Superb MK3) 5Q0698151AA 5Q0698151AH 8V0698151B TRW GDB1956 front brake pads for 312x25mm front brake discs (Superb MK3) https://www.amazon.de/TRW-GDB1956-GDB1956-LUC-FPS-Brake-Pads/dp/B0113713JA/ref=sr_1_1_sspa OEM part numbers 1K0615301AA and 5Q0615301F both lead to the same aftermarket front brake discs. OEM part numbers for front brake discs (312x25mm front brake discs) (Superb MK3) 1K0615301AA 5Q0615301F

225/45R18 is a standard Octavia MK4 tyre size, so a 225/45R17 tyre will have an outside diameter that is 1" too small for the Octavia MK4. 225/50R17 is suitable for 7Jx17 ET46 rims on the Octavia MK4, although it is not a Skoda approved tyre size. The 225/50R17 is used on the Yeti and Octavia MK2/3 Scout...all on 7Jx17 ET45 rims. So 1mm different from ET46. The standard 18" and 19" rims on the Octavia MK4 both have a specification of 7.5J ET48 for their 225 tyre sizes, ie. 225/45R18 and 225/40R19. ET46 is only 2mm different from ET48, which means that the centre of each tyre is pulled 2mm further out in each wheelarch...which gains you 4mm of extra track width. Considering that some owners fit 15mm spacers, which changes the offset by 15mm...ie. the ET48 offset would be effectively changed to ET33. So by comparison, a 2mm difference in offset is very small. If I was looking for new 17" alloy rims for the Octavia MK4, one of the specifications I would consider for a 225/50R17 tyre size is 7Jx17 ET45 because that's a common specification and fitted to the Octavia MK2/3 Scout, Karoq, and Yeti...and ET45 is still only 3mm different from ET48. My own view on changing offsets is 3mm less offset than standard is a small difference, 5mm less offset than standard is a modest difference, 7mm less offset than standard is generally the maximum I would consider, but up to 10mm less offset than standard in certain circumstances (such as if that was the only suitable rim for a certain tyre size that I wanted). In any case, the lowest offset I would consider for 5/100 hubs is ET28 and the lowest offset I would consider for 5/112 hubs is ET33...because those are the lowest offsets that VAG have used for those hubs.

If the OEM part number 1K0511115BD is what the car left the factory with, then I suggest going up two in the hierarchy to 1K0511115BF. If you are going for aftermarket rear springs, then be careful with the selection because different brands will often have different ideas about what the specification of any OEM part number should be. Many aftermarket springs are sold to replace more than one OEM part number, so may be stiffer than the required spring. However, the below three Sachs springs are each listed to replace just one spring each...so should be an exact match. Have a look at the specification given by Sachs for 1K0511115BD, 1K0511115BE, and 1K0511115BF rear springs. 1K0511115BE is one up in the hierarchy compared to 1K0511115BD, and 1K0511115BF is two up in the hierarchy compared to 1K0511115BD. The increase in wire diameter from 11.25mm to 11.50mm gives an increase in spring stiffness of about 5%, whereas the increase in wire diameter from 11.25mm to 11.75mm gives an increase in spring stiffness of about 10%. gknautomotive lists the 1K0511115BF rear springs for the Octavia MK2 estate without towbar (front wheel drive including 1.2TSI, NOT 4x4), and gknautomotive lists the 1K0511115BG rear springs for the Octavia MK2 estate with towbar (front wheel drive including 1.2TSI, NOT 4x4). Sachs rear springs 1K0511115BD Length 352mm Wire diameter 11.25mm https://www.autodoc.co.uk/sachs/1232470#coil-spring Sachs rear springs 1K0511115BE Length 348mm Wire diameter 11.5mm https://www.autodoc.co.uk/sachs/7059747#coil-spring Sach rear springs 1K0511115BF Length 354mm Wire diameter 11.75mm https://www.autodoc.co.uk/sachs/1232501#coil-spring gknautomotive online spring catalogue https://web.tecalliance.net/gkn/en/home?sessionArticleCountry=GB&sessionTargetCountry=GB