Can someone cross reference some part #s for me?

[ENDEE666]

Basically, I am trying to find out if the B7 S4 rear brake conversion intended for the B5 S4 (300mm rotors with adapters using B5 S4 calipers) will fit on my C5 A6. Now I know my front brake setup is exactly the same as the B5, but the rear setup is different. So what I am hoping is that the hubs & whatever else are the same so that the adapters & S4 calipers will still bolt up & align with the 300mm rotors...

So I need someone to cross reference part #'s of the rear hubs & anything else that will be needed for the kit to work.. Thanks to anyone that can help out on this. Or if maybe someone already knows it will fit..

[ENDEE666]

Got a little update that shows more promise for compatibility. I crossed reference rear pad model #s from the B5 S4 to the C5 A6 on ECSTuning's site and they are the same for every brand.

The rear rotors are very different. I was looking at a friend's S4 rears and they are 2 layer, vented vs 1 layer solid. And they are also not set back as far behind the wheel..

So ultimately, it comes down to if the calipers are where the difference is or if its where they bolt to thats the difference.. Hopefully someone can help shed light on this...