The thing behind the CD changer compartment in a 1997 BMW 528i is called a jack.
It is located in the glovebox.
On the back of the housing
If your x5 is equipped with a CD changer, it will be located behind the driver's side panel in the very back. This is not standard equipment, however.
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In the trunk on the passenger side behind the panel for the CD changer.
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With some basic technical know how,installing the Pioneer CDX FM687 CD changer should be an easy tsk.
A local electronics outlet like Best Buy typically charges about $115 to install a CD changer.
it is on the left side of the trunk behind the CD changer.
$21,875 with 6disc CD changer and premium wheels Norms_Nola
On BMW E39, which ranges from 1997 to 2003, it is behind the trunk covering on the left side, right behind the CD changer.