Cat D series backup Camera??

I just bought a Cat 249D rental unit that was pretty loaded up minus the backup camera, which displays on the LCD screen with the gauges. I tried to get the dealer to throw it in but that wasn't happening. So I'm wondering if somebody here who has one can post a pic of how the camera mounts to the back door (easy part) and where the camera plugs into the wire harness. I'm just curious if there is a way to make a generic camera work. I know I know, Its a CAT so that's probably unlikely...

Cat D series backup Camera??

Cat D series backup Camera??