This was easy and works great. Drilled one hole in the back of the plastic tub where battery is. Added a grommet and a little silicone to seal the hole and that was it other than connections. I have the Sony camera option offered by Seicane and works fine.

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X5 4.6 2002 Black Sap, Black interior. 2013 X5M Melbourne Red, Bamboo interior
Dallas