It's not an easy task to replace BUT definitely worth it if you feel up to it!

Look at these instructions posted on this forum...
http://www.xoutpost.com/x5-e70-forum/...-swap-diy.html

You can buy them from JleviSW.com, Bimmiam.com and others.

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2008 X5 4.8i | Wheels: Summer> style 336 20" RFT; Winter> style 214 Ferric Grey 20" RFT | Aero kit | ESS E-Flash tune | V1 | LCI Rear Tail Lights | Coding completed | Engine replaced at 90K