Thanks for all the input. I had a chance to get under the trucks this morning and measure the mounting points. At least on the 65 C10 and 63 C20 there does not seem to be any difference on the mounting points, the beds should interchange without any problems. When I first took a measurement I thought there was an inch difference between the mounts closiest to the cab.

Regards,
Larry

I don't own a vehicle that isn't old enough to drink.