Tv for this mount and how to install

That is a standard VESA mount. Any modern flat panel television/monitor should work. The thing to keep in mind is how much weight it can support. I suspect that anything that fits would be acceptable.

 

Standard VESA mount. There are two variants one has 75 mm spacing the other 100 mm spacing of the mounting holes ( about 3” vs 4” between holes).
Your’s is probably 100 mm for larger sized TVs. The 75 mm was only for smaller monitors (under 21” usually).
All modern TVs will bolt right onto that.

 

I would simply measure the width of the cubby, and find the largest that fits. Be sure you look at the size of the complete tv, not just screen size.

 

Some have the holes for both, can also get an adapter plate. Any computer part store would sell them too.

 

Looked at your photo again, not much room there. Looks like it has the holes for both 75 and 100 mm mounts.
If it was my truck, I’d remove that mount and get a swing arm style so you’d have more flexibility of size and viewing angle.
The only problem I’ve experienced, most TVs are not meant for a mobile environment. With all the bouncing around the truck does, the VESA mount on the TV cracks all around the perimeter of it. So I had to secure the tv when going down the road. Bungee cord or tarp strap would help.

Amazon.com: swing arm tv wall mount

 

I have this same mount but it's missing the outer part (part # PACCAR T11-6216 REV A 20668AA) so I cannot mount any tv at all. Sucks. Oh well.

 

Did You Figure Out What Screws And TV Size Fits?