If all else fails there are RV Junkyards.. One (or more) may have one (or more) of your exact make and model, screens and all.
If you have a frame but the screen is shot.. Any decent hardware.
Side note... On one of my Electronics cabinets I felt the need for SERIOUS inprovements in air circulation.. Now the back I was able to open up with my hole saw. but the front was plexi (plastic glass) .. It's now black Window Screen.. A decent hardware.. one of these days the other one will match it.. Really like the way it turned out.