The H&R spacers (adapting your 74mm series hub to a 72.5mm wheel)
that were shown here and on other forums will not work for the x5 e70. The wheels will have to be bored which is not as easy as some have made it seem or you will have to order a custom adaptor. I recently order a 10mm spacer/adapter for this set-up at
www.adaptitusa.com/ for $70.00 shipped. The adaptor is hub centric but not wheel centric like to H&R spacers. Also, if you grind your wheels down like many on this forum have done your wheels will not be hub or wheel centric and will probably have shimmies and other issues.