softscoop

Looking at the part diagrams, that buckle is not available separately. It's part of the centre seat belt. https://skoda.7zap.com/en/cz/superb/sup/2014-768/8/857-857075/#30 Searching for that part no - 3T0 857 807 , shows the buckle and centre belt as one piece. https://www.skoda-parts.com/spare-part/3t0857807raa-seat-belt-middle-38028.html You can see the buckle isn't removable from the entire belt assembly.

Here's an RS with the rear arm rest https://auto.bazos.cz/inzerat/156781214/skoda-fabia-19-tdi-rs-162kw.php

How about a race blue elegance with vRS bumpers and beige interior? https://auto.bazos.cz/inzerat/156943068/skoda-fabia-i-19tdi-pd-rs-paket-1majitel-160tis-km.php

You do see some odd spec cars in europe. I remember when I did the Skoda factory tour, and one of the workers showed us his mk1 Fabia. Cayenne Orange 1.9 TDI PD100, with vRS bumpers and interior. All original from the factory to his spec. Saw a lot in the factory car park with a small extra badge on the boot lid, which meant something like "Factory worker specified and built car"

You're thinking of the Octavia. Mk1 Fabia only got headlight washers if the car had xenon headlights.

Were the vRS leather seats a Skoda UK option only? It would explain the complete lack of info around them. This brochure seemingly lists all 6Y Fabia accessories that were available to order, and leather seats isn't one of them. SkodaFabia_Katalogove_listy.pdf

Even this 2006 price list says xenon is vRS only Fabia 2006 Price List.pdf

So xenon was an official UK option on the elegance at some point? I've spotted a couple of elegance with xenon and always wondered how it was possible, as I don't ever remember seeing it as an option in the brochures.

Elegance should already have cruise control as part of the standard kit.

Look like 18" replica of Hartmann HRS6-204-GS https://www.achtuning.com/hartmann-hrs6-204-gs-19x8-5-et47-wheel-for-audi-and-volkswagen/

Here's an article from the time the option was made available https://www.carpages.co.uk/skoda/skoda-fabia-14-02-06.asp

Are you looking for tyres to go on your existing wheels, or a set of wheels with tyres?

I'm pretty certain that those tyres are far too tall a profile for the Superb. A 45 or 50 would be more similar to the original size.

Thought I'd tidy this up with an updated list. 5 non-vRS models: CE07 FUG GK06 TGO JM05 APM WJ06 PVL WV05 HWD 23 vRS models: CN06 WUY EJ05 DGY EJ54 KAA ET06 GOA GJ54 HLK KM06 ZTY LN04 AVJ LV04 UNL MA54 UYX MT55 MZX OE55 JUX OE55 LSZ OE56 CMZ PL05 VUG RA55 KWL VN05 FZJ VO06 HHB WG55 WYC WU54 HJA YK04 ZEX YT55 MPX YT55 MRX ??56 ??? - Yellow. First reg 17/11/2006. I have a copy of the ebay advert at the time, but unfortunately not the pictures. I know it's different from the other 56 reg yellow vRS as it's a different first reg date. Pics to follow.

Looking at the image you posted, it definitely looks like a factory setup. If you haven't got a maxidot MFD menu to access the car's settings and adjust the volume, you might need to adjust it with Carista, VCDS or similar diagnostic tool.

Have you got a sunroof? They are prone to leaking

Was your old Octavia a mk1 or MK2? Only wheels from the MK2 will fit, but definitely 16" is the way to go. I managed to source a full set of mk7 Golf 16" wheels and new tyres than it would have been just for 18" tyres

Just a thought, but if you don't think you could fit a replacement belt in time for the MOT, do you have anyone you can borrow a child's car seat from for MOT day? If the car seat is the type fitted by the belt, where it physically clamps onto the belt, and the cut is hidden by the seat being fitted, they can't remove it to check the belt. You'll have advisory of: Nearside Rear Child Seat fitted not allowing full inspection of adult belt, but it should pass. Obviously I wouldn't recommend it normally, but if you know that no one is going to sit in that seat until you've got a replacement belt fitted, it will allow you the time to get it sorted.

Just a thought, When you're in reverse, does an image of the car show up on the radio? Where are the sensors on your rear bumper located? The "S" trim of car didn't come with rear parking sensors from the factory, only "SE" and above trim did. I wonder if someone has fitted an aftermarket set of parking sensors, which are not integrated into the car settings in any way.

Disconnecting the speaker will totally disable the entire system unfortunately. Can you post a picture of your instruments and radio setup?

Nice find. That looks like one of the most comprehensively specced cars I've seen. The only thing I can think it's missing is leather, which I don't even think was a an option in 2004 anyway. Bit pricey though!

Is your car a dsg? It's quite common that the inline thermostat to the oil cooler for the gearbox can stick open, causing the above symptoms.

What is your budget?

Autodoc list plenty of different manufacturers with that part no, including ATE https://www.autodoc.co.uk/car-parts/oem/wht003858a

Don't forget when in auto the lights will come on when it's raining, regardless of how dark it is.