I was wondering if anyone out there knows if a 1966 D300 and 66' D600 have the same doors??

Or does anyone know where I might find a door for a 1966 D600??

Been checking everywhere and have yet to find anything.

Any advice would be really helpful!

 

Might try calling a junkyard, and see if they have interchange manuals that go back that far.....

 

^^ What he said. Either junk yards or maybe a "barn find". Put a want ad in craigslist.