I can't remember their sizes, personally I'd use any bought from a reputable seller, apart from Brembo. You may have to take off the rear calliper carrier bracket off to get the rear disc off the hub, some you do, some you don't. I did, the carrier bolts are tight & hard to access if you don't have a lift. You also need a special torx type tapered socket to take the carrier bracket bolts off, I bought a couple from my local motor factors, as they only came in twos. I found this out whilst changing my last rear set on my previous 19 plate 1.5tsi dsg se, Octavia. Plus the calliper carrier bolts need to be tightened to a specific torque. Best to have a rewind kit to rewind the rear brake piston back, too. It's a lot easier of a job if the rear disc comes off the hub without having to remove the rear brake calliper, carrier bracket, too. I'll replace my fronts next myself, the rears, I'll take to an independent garage to have replaced, as the rear calliper bracket has to come off. I'm working off my drive using axle stands & trolley jacks. Plus I'm not young, anymore. I just found an old post of mine, this may help you-