If you ever had a "Mechano" kit when you were a kid then the CD changer/NAV computer/Amp/Voice control etc... mounting assembly will look familiar!!!
The part you are looking for is item #10 in the parts list, follow this Realoem link.

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Cheers, Brian

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2001 X5 4.4i Sport
Black Sapphire, Hi Gloss Shadowline, Full Privacy Glass.
Too Cool for Jack Bauer