Most people seem to think the original AD 1/2-ton wheel base is about 1" too short for the body: the rear tire crowds the front edge of the fender. That S-10 wheelbase of 117.9 is about 2" longer. I guess a little fudging both ways could make that set pretty good, or add about an inch between cab and bed??
DForbes if you have a 1-ton with 137" WB the bed is 9' long and I think is so cool. In high demand, too. Have you verified which it is?