Take note of:
- Wheel bolt pattern (5 x 120)
- Wheel offset range (aprox 30mm -50mm)
- Hub bore (72.56mm)
You can get an idea of the approx wheel offset range by pulling up the X5 wheels on realoem.com. The parts database lists the wheel offset in the supplemental column in the part number index. Take note of the wheel offset of BMW wheels that have the same width as any after market wheels you're considering.
Hint: the X5 is similar to the 5 series in that BMW threw a monkey wrench into wheel swapping. All 5 series before & after the e39 have a 72.56mm hub while the e39 has a 74.1mm hub. The e70 X5 has the larger 74.1mm hub while the e53 X5 has the smaller 72.56mm hub. And now with the explosion of AWD BMW cars...many of those models have wheels with a HIGH wheel offset vs a low offset on the RWD (rear wheel drive) models. And lastly, the X6...has an odd SPLIT axle hub size difference. One axle has a 72.56mm hub while the other has a 74.1mm hub...I always forget which one is which.