I made custom brackets from 5mm plate steel. Then i mounted tt/s3 rear calipers and carriers. Used oem s3/tt pads and oem corrado g60 280mm front discs. Looks awesome behind the wheels. Ive also got 4 pot setup on front, but not driven with it to see what balance is like. However i do have a pair of fluid restrictors to fit if needed. These are another oem find from a 1996 a6 tdi avant.
Hth
Tom