Just measured the wheel centers. Info I found is correct. The center openings on the REARS: 72.5mm FRONTS: 74.0mm

X5 hub rings ON THE VEHICLE will accept the 74.0mm openings both front and rear. I will have to bore out the REARS from 72.5 to 74.0. Cost will be 50 bucks for each rear wheel and then I'll be able to mount them.