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Here is what I researched when I was was looking at fix my brake fade issue last year...
This will require minimum 17" wheels, but be warned - ONLY BMW 17" wheels will fit. They have a recess on the back side that allows them to clear the 6 pot caliper and the larger caliper on the 35i/35is. Non BMW 17" wheels have issues fitting.
Rear set up. The European 23i and the 30i share the same rear brake pieces, and the European 35i and 35is share pieces. My figures show that the US version of the 35i uses the same parts as the European 30i, while on the 35is uses the larger rear setup.
sDrive23i [Euro & non US]
Front Caliper 34 11 6769091 [L]/ 2 [R]
Front Carrier 34 11 6769095
Front Rotor 34 11 6772669 [300x24]
Rear Caliper 34 20 6786057 [L]/8 [R]
Rear Carrier 34 20 6786046
Rear Rotor 34 21 6782605 [300x20]
sDrive30i [both US & Euro model] & sDrive35i [US model]
Front Caliper 34 11 6769093 [L]/ 4 [R]
Front Carrier 34 11 6769097
Front Rotor 34 11 6782601 [330x24]
Rear Caliper 34 20 6786057 [L]/8 [R]
Rear Carrier 34 20 6786046
Rear Rotor 34 21 6782605 [300x20]
sDrive35i [European Model]
Front Caliper 34 11 6773201 [L]/2 [R]
Front Carrier 34 11 6773203
Front Rotor 34 11 6782593 [348x30]
Rear Caliper 34 20 6786067 [L]/8 [R]
Rear Carrier 34 20 6786069
Rear Rotor 34 21 6782607 [324x20]
sDrive35is [Both Euro & US]
Front Caliper 34 11 6773201 [L]/2 [R]
Front Carrier 34 11 6773203
Front Rotor 34 11 6782593 [348x30]
Rear Caliper 34 20 6786067 [L]/8 [R]
Rear Carrier 34 20 6786069
Rear Rotor 34 21 6782607 [324x20]
While some of the other BMW non- E-Brake disks measure the same across the major dimensions, he offset between the friction surfaces, wheel mounting surface and where the caliper mounts will not match and will cause a few issues [which can be corrected with some machining/spacers. I think the loss of a back up [Emergency] brake system is a larger issue and will require substantial coding. this is pretty much why I held off on the rears, plus with the re-coding by BMW and Schmickler the brakes are pretty well balanced.
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