There is a hex screw holding the vertical housing, it's located at the bottom end.

BMW X5 4.8iS 2005

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BMW X5 E53, 4.8iS - 2005
Professional Stereo/Nav with DSP (modified BM54 module) - Converted to Eonon GA5166X with Reverse cam
4-Corner Air Suspension - Converted to BC Coilovers