I was only able to find one bracket to mount the screen of my backup camera to the mirror of my truck but it didn't fit well, so I designed my own. This bracket it printed in 3 parts and then held together with 4 m4 screws. The screws for the front plate of the bracket are inserted through the front of the base through the large holes. This design also utilizes the metal bracket that came with the screen. mounted the metal bracket with 3 m4 screws with nuts on the back side, but only 1 screw is really necessary. The screen that I have is similar to the one in the link below and was purchased from amazon.

https://www.amazon.com/AMTIFO-Wireless-High-Speed-Observation-Trailers/dp/B078PDH6Z8

I printed in PLA, but after one hot day, it was deformed and no longer usable. I reprinted in PETG and it has been fine to leave in the truck.