Barry,
Thanks for the info. The rims are drop center not split rim. From your description, they must by 37-38 rims. I'll keep looking for original rims (and an aftermarket inside mirror) but for now, I have an extra set of rims from my 67 that will work.
I don't think this truck was on ebay. From what I can tell, this truck came from the Roswell area of New Mexico. A fellow down by El Paso Texas found it in a yard in Roswell and brought it down to Southern NM. After about 8 months of some serious buyers remorse, he had second thoughts and passed the truck on to me. I think I'm the first person to touch this truck in 50 years. My first task was shoveling out the interior that included the remains of a large (cow size) animal. The truck has the look of a ranch truck. Looks like it spent a number of years bouncing over desert roads. Cracks and breaks all over the fenders and bed. The original owner must have had a stick welder and this was his fix for everything that cracked or was about to fall off. Even welded on trim pieces.
I will post a picture but it is almost embaressing to admit I paid real money for such a wreck. What can I say. I've always had a real weakness for 39-40 trucks. They are my absolute favorite.