Actually you're correct, (my mistake) the rear seems to just be a match to the wavy style fronts, but the offset of the rotor hat needs the caliper spaced a few mm (around 3mm) to work I think, not sure yet I haven't done the rears, but was talking to someone who has via email.
Rear RS5 Part # 8t0615601a
Rear RS4 Part # 8k0615601g
If you want the bigger front rotors...
Front RS7 Part # 4g0615301e (390mm x 36mm)
Front RS5 Part # (stock size, whats on my car) 8T0615301
Pictures of the 390mm front and rs5 rear on a c5 rs6...
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