Looks very similar to one in my '63 Catilina, Travel Heater [Elkhart Indiana]. Works flawlessly, simple design. Used another in my ice shanty, comon to early campers in my area. Your high limit shutoff may not work on the bench. Both of mine have a small thermostat aprox. [1 1/2" dia x 3/8" thick] behind the grill near the top that shut off the gas at high temp limit. My heaters wo'nt cycle properly if not enclosed. You can replace pilot tube with common stock. Right now on Ebay someone has a number of Airstream pilots and thermocouplers for sale, N O S, I picked up a couple of spares. If I could find two of these heaters that match I'd kick that nightmare furnace in my safari right out the door! Hope this helps.