@Ramhighflyer
I went out to the garage to take a look at one of the used mirrors I have, with a camera mounted in it, and took some pictures. The camera assembly has a bracket that the camera clips into...and the bracket has a notch and a screw attachment where the camera mounts into the pre-drilled camera hole. There are numbers on the bracket: 26223021, which is not a typical Mopar part number style. I'm thinking the bracket is only available as part of a OEM mirror with camera installed assembly.
As a side note...there is also no part number for the bottom cover of the mirror housing where the camera is mounted...I've looked for a part number and there is none, and I had a Mopar parts dealer confirm there is no separate number...it can only be had with the whole mirror assembly.