I've thought of using 7er wheels as well, but then the wheels' are narrow vs the x5's. Might not look right and/or perform the same even with the correct tire specs, Not proven just speculation

Wheel style 128.
 

I just received my wheel style 128 made for '09 7 series, I tried to fit-mount them without tires..And gues what?? They fit like a glove. the offsets which are 25mm all. didn't even stick out that much at all, they are right at the fenders. I will post picture soon when they are tire mounted. They look awesome. I love the 87s, but these are the new bad ass!!

They are 20x9 and 20x10.
the following pictures are not my X, but they are the wheels.

http://www.xrims.com/imgs/dynamic/ma...Picture010.jpg

http://x3.xbimmers.com/forums/attach...1&d=1260594982

http://www.m5board.com/vbulletin/att...k-no-plate.jpg

Just a reminder, my bore sizes are identicals to that of the 7 series.

oh yeah.. that 5er touring is one of the nicest I've seen sitting on factory wheels.