I believe if you look at Bruno's site you will see that the calipers and carriers for the 7xx and 540 are the same. The rotors for the 7xx will not fit but the rotors for the 540 are a match. I have these calipers and carriers on my work bench waiting for the proper brake job time to install. I installed this setup on my last 535 with no problems. The stock rotors are 302x10 and the 540 are 302x20 vented if I remember correctly. I am also going to go with the slight upgrade of 540 rotors on the front of my 535 so I can run 15" winter wheels.
Mike Holbrook
Meridian, Idaho
1992 535im, 17", Euro M5 Throwing Stars 8's & 9's, FK-451 235/45s & 255/40s, M5 Sway Bars 25/20, Conforti chip, Lowes Ram Air, glass sunroof