The cameras mount from the inside of the mirror with a backing nut, PIA to get to. My cameras were tight, it was the mirrors that were loose. The system as a whole is not the greatest, poor picture quality, especially at night. At some point I'm going to remove my rear camera, check to see what type of connection it has, and probably replace it with better quality. Cameras are cheap and easy to find, just need to know what type of connector it has.
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