We recently purchased a new to us 1993 Coleman/Fleetwood Seneca. We are redoing the complete interior, with plans to work on the exterior in the fall. We decided we weren't comfortable with the old propane furnace for heat (we will get an electric heater instead) and removed it for extra storage. We've decided how we will cover up the hold on the inside of the camper, but aren't sure as to go about covering the hole on the outside. We we hoping to discover some sort of plate that would fit perfectly. The opening is approximately 3"x5". Any suggestions?