My new Cougar has the Furrion bracket at the back and a power lead.
I got myself a Haloview MC5111, designed to fit using that bracket and power lead. Do a Google search, you'll see a few reviews.
This is the 5 inch screen model, they also offer a 7 inch but am not keen on that big screen on or near my dash. The 5 inch is perfect.
The picture is of very high quality, 720p, bright colors, crisp and clear. Reception is excellent, 35 ft long rig in my pickup.
Better yet, it has an SD card slot and will record, continuously. Love it.
At $250 it's a great buy. Thumbs up.