The answer to this is simple. Old Town has changed the style of their decks over the years. The changes have resulted in several distinct styles of decks as they evolved from the original type. What you receive today from Old Town is not the same as what you would have gotten on a new canoe in 1936. They, like anyone else, could fabricate the style you need, but I'm sure they won't- not worth it to determine which style your canoe had and then attempt to replicate that style. If you have the capability, make them yourself. If not, ask a woodworker for help. If you've got the originals, just trace the cutout and replicate that. If not, many people here would probably be happy to provide a tracing. I certainly would be happy to do so.
Michael