Do you have a picture of the old control panel? Or is it missing completely? They were not RV brand specific so they should be available if you can match it up. Check places like
Tweety's RV or some of the other older, larger dealers. Just as an alternate, I have had a plaque/sign company make me up a face plate with the proper information on it and had them cut the holes for the switches. It was made out of the laminate stuff like they make name plates out of.
Aaron