Remove the lens cover from the other side. Inside there should be a manufacturer and part number.
I got my wrap around Bargman lens cover from Amazon for $8.00, 50% of what a CC repair shop charged.
You will find that most body parts are sourced from a larger population of vehicles and that Overland (like most other MH manufacturers) did not make much custom stuff except the fiberglass panels.
My 1995 headlights are from a Ford Bronco, for instance.
1995 CC Magna #5280
C8.3L 300hp Cummins, 31,000lbs