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I have 135i rear brake calipers. However, calipers will fit on the wheel carrier but 328i discs are 300x20 and you need 336x22 for the calipers. Problem is that 135i discs will not fit on 328i hub. You need 330i discs and 330i hand brakes.
I ended up buying used 335i wheel carriers and half shafts, new wheel bearings, brake shoes and ABS sensors. It was PITA but it works.
BTW: I’m using BMW performance rear discs part No. 34216795755
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