I added the GM one. You'll need the mirror, cable to the camera and the camera w/bezel. Its all PnP. I finished install today. You'll have to route the cable on top of the headliner, but its easy, just route it right on the edge all the way to the back, go through the grommet at the hatch, remove the hatch trim panels and follow a harness w/zip ties down to the camera.
Mirror - 84127821 cost me $200
Cable - ebay, search for seller "levin_motors" or "speedometerpros". They both stock the cable for $60-$70
Camera - 84271644 cost me $150.
Enjoy!