I've seen backup cameras installed in the license plate frame. Not cheap though! Post your results if you do go ahead with it.

Check out this one: https://id289.securedata.net/reverse...ex.php?cPath=9

or this one: http://www.visorview.com/backup_cameras.html

Good Luck!

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2006 X3 - Flamenco red, Beige Leather Interior
Premium Package, Heated Seats & Steering Wheel, Satellite Radio Pre-Wired, Privacy Glass