Hats off to Rob Fisher (the OP) for letting the world know about this discovery.
If I may be bold enough to add my own discovery. The 2010 Honda ACCORD coupe door seals are also the correct size. I bought a pair from the local salvage yard for $16 for the set. They are the perfect size for my 1965 C10 doors . . . and . . . there is no “corner” in the 2010 Honda Accord coupe gasket. Here’s a video of what I did to install them in my 1963 cab. I hope this helps someone.
https://youtu.be/61p_8To5Ygc