Sal, for the 09 335i E90 with stock 18inch wheels, 12mm spacers work well and are totally safe with regard to rubbing (I have them). If you want a little more aggressive I'm 99% sure 15mm will not rub in the rear, unless you have some kind of unusual suspension setup. I'm on BMW performance yellow springs, slight drop.
For the OP, I have no idea. Aren't there nice 17inch rims available on the forums that are inexpensive?
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