I recently picked up a 2004 325i (meaning an e30 convertible is now for sale) and I'm trying to determine the allowable wheel sizes to remain in Showroom. I believe the sport package came with 17x8s. I've come across a good deal on a staggered setup from a 330 (17x7.5 and 17x8.5, perhaps), but I'm not sure this is allowable given the "from the factory" requirement. Can I get some input on 1) is the 17x8 my only factory option for the 325 and 2) would the staggered setup, if I have it correct, be ineligible?

I plan on buying soon...

Thanks,
Brandon