I used wheels and caps also, with mixed results. Make sure your wheels balance ok - spinning each of them alone won't reveal flaws you may discover at 75mph with the X as sensitive as it is. They could be warped/out of round... even though they say once you mount them you can't return them, you should still let them know and work out something... they will still give you a percentage. I got screwed assuming / not knowing this.

Anyway, they originally sent me 4, 1 returned out of round immediately, got another back for it... but yet another was warped without me knowing (installer was also sketchy about it). I bought a replacement at full cost a year (and lots of headaches) later... that replacement came scratched so I had to RMA that one too for a new one. Just not as easy to deal with because of the sending back and forth. Heh - they had to send me 7 until I got a set of 4 that were fine. Anyway, if you decide to try your luck, make them get it right asap - don't let time pass.

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'08 X5 3.0si - Alpine White / Saddle Brown interior
Specs: Sport Pkg, Premium Pkg, Tech Pkg, Comfort Access, Aero Kit, Style 433 staggered 20s on Conti DWS
Mods: Carbon 35 tint, LED angel eyes, GP Thunder 7500k fogs, H&R 20mm/25mm spacers, clear reflectors, gunsmoke-tinted taillights
Coded: Digital speedo, windows/sunroof/tailgate close via keyfob

X5 pics at Flickr