Just in case anyone ever wondered, it is possible to fit Z4 figment wheels on our cars. Mine is sitting on (and not rubbing) the z4 18x8/18x8.5 combo with 225/40 & 255/35 rubber. Some massaging might be required, but alaskablue had already done the spacers(22-23mm IIRC) and the classic baseball bat fender rolling. The kw's ride height wasn't adjusted at all. Anyways, on to wheel pron.
Before, with the square 17x8.5 BBS with 235/40 rs2's
After, with the z4 wheels and tires....
For giggles, we installed the rear fitment on the front(8.5 w/255) and it cleared the outer fender but rubbed in the back of the inner fender at full lock(no fix to that)
I will try to roll the car out in the sunlight to catch a better picture tomorrow. It has just been too warm to work in the daytime here.