Since the 4.8is has a "spacesaver' style spare, it uses the bottom tray as shown in your diagram. As a result there is a storage area under the hard floor that is about 2 - 3 inches deep, very handy for stashing all those bits and pieces. There is also space around the spare to put things, like the towbar for the hitch.

John

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2006 Black X5 4.8is