Brad, I didn't realize there was such a variety of heaters offered. I have seen the first model in red and blue but couldn't visualize how they were installed. That is a great little book you have there. Those '54 era models make more sense as far as fit with my truck.
52vff, that looks like what mine would have had. Haven't found one like that for sale yet, but I will keep looking. Are you able to see the part number on it? It would help me in my search.
Thanks a lot guys for the info.
James