Can anyone confirm the part number of the brake disc that works with the 993tt big red / RS@ bracket combo? I was told it is from an A8L, 4D0 615 301 A, 323 mm by 30 mm, but this seems to correspond to a european S6 Plus. Also, best source to buy? Thanks, Sean Sean Douglas 1997 Audi S6//RS2-spec 1990 Audi 90 quattro 20v