Vagbremtechnic
Rear 356x22mm Disc Upgrade Kit For Audi RS3 8Y (DI0019Y)
65 to 68mm centre bore adapters.
These are used to centralise a brake disc which has a larger centre bore like from the Audi A4 type chassis when being fitted to a smaller vehicle centre bore like the Golf Mk4/5/6 type platforms.
Price is for a single ring