Look around in the RV and see if you can find the missing components. There should be a mount that screws onto the back of the TV and then kind of snaps into the part that is mounted to the wall. I threw mine out two weeks ago when cleaning the garage or I would mail it to you. I bought a better mount from MoRyde that swivels so we can see it better when camping. Here is the one I bought from Amazon but go to the MoRyde website, they may have something that will work better for your needs. the MoRyde is a much better mount.
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1