I had it narrowed down to the 11001 hubs or find a used hub, I found a used one. I saw a 60-66 Burb (chevy), a 64 K10 Chevy and my 64 GMC k10 that had the same hubs on them (spicer made them too) so I am pretty sure that the chevy/GMC 1/2 tons had the same hubs. See if you can return those if you buy them, just in case, if you end up buying them and they work, please put up a post about it. I know a bunch of others, including myself would like to know for sure.
I bought a set of 70s dana 44 hubs and that is how I figured out that they don't fit, and that they could be made to fit, but I want to keep my truck original as possible.