I have seen in person an f80 msport brake swap, full calipers and rotors. I can't remember which one, but either the front or the rear is a direct bolt on swap (I think the front) and the other required light modifiction to the f80 caliper to get it to sit center on the rotor.
There are a couple of good threads about it if you search. At first I was going to do the 335i swap, then I saw this guy's car and was like nope, this is what Im doing lol. Good luck.
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