My unit sits very tight without the screws, tried going over bumps and hard accelerations without issues...it stayed in place. I've put the screws on anyway just to be safe...I tightened them enough to be able to put the caps back on. I was lucky with this I guess.

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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