BMW Z4 Forum : “I would likke to purchase original BMW wheels that are 17" or 18" for my 2003 Z4...”

There are a lot of factory rim websites online, or you can check Ebay.  Both of those items should be available through Ebay or through a dealership.

The other question I have related to the wheels is about sizing. I don't have an M car so it's my understanding tht I can't use M wheels that are staggered and would need 17" or 18" Z4 wheels. Do you have any info on what I can or can't do related to size on the wheels? I'd like to keep original BMW wheels on the vehicle and find a set that someone has taken off to install aftermarket wheels.  

Thanks. Haven't had much luck finding a set that someone has removed from a 3.0 Z4 with the larger wheels. I'm looking for a set that were taken off a vehicle for aftermarkets. I'll keep looking.