Will an M3 BBK bolt right up on a 330? There is an M3 StopTech kit for sale here which would save me some money. If the caliper doesn't line up right, I know I can get a new bracket from StopTech, not a big deal.
I'm more concerned about the ebrake.
I have the UUC wilwood 4 wheel kit (uses OEM M3 rotor sizes) and the OEM M3 rear rotors work fine with the 330 ebrake. I figure that it is safe to assume that the 330 ebrake will work with any M3 rotor that works with the M3 ebrake. But maybe I am missing something. All of my savings in getting this used kit will be eaten up if I had to swap in some new rotor hats in the rear for the ebrake.