Raising an old thread but spent some time on researching fitments so thought it might help . All mk7 appropriately sized parts fit as well as A3 8v parts. I recently bought an A3 35tfsi with 19" wheels. Bought on ebay a spare wheel 18" from a vw mk7 gti 2018 for £75, a jack set from vw mk7 for £45, a spare wheel well liner from an A3 8v for £35 and plastic bolt for £7.50. Could have got a spare wheel for less but of indeterminate age. Very pleased with the result and price😬