For those of us in the U.S (or that have U.S. models)

, we were lucky enough to have our X5's come equipped with a spare. I for one know I will never use it due to the fact I run 20"s on mine. Now, for the European models, they came with no spare, and instead there is a finished area that can be used for storage. Just finished putting mine in, I am pretty happy!
For those of you interested, here is the part numbers needed for the job:
LUGGAGE COMPARTMENT PAN (1) Ea PN 51476974232
FIXING PLUGSCHWARZ (9) Ea PN 51471911992
Here are the Pics:
Enjoy