Boy - @Sixpactogo, that's simply splendid!!
My 65 Monaco had rear seat belts from the factory. The mounting points were not in the floor pans. There are 4 large eye bolts mounted in the bracing from the floor pan to the package shelf. They are original and not a previous owner wanting rear seat belts as they are painted body color.Yeah, it is.
I wonder, Did they make three different floor pans just for optional seat belts mounting bolts?