ET35 will be out 3/4" further in the rear than the stock wheel. You will be limiting the tire you could use by a LOT. A 245 might work in back on these wheels on a lowered car... more than likely you'd need to go to a 235 if the tire runs wide.
Stock 135i rear wheels are also 8.5" wide, but are ET52.
Stock 3 series 8.5" rear wheels are ET37.
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