Hi guys quick question regards the B5 RS4 discs. (car already has B7 calipers) whats the dimensions on a standard oem disc? also dimensions on a B7 disc? apart from the drilled B7 discs as being an upgrad (how much are these?), what other discs are out there Ive been reading the VW W12 Phaeton Discs fit. what are the dimensions on these and price? and has anybody fitted these yet? how do they measure up?