Internal dimensions of all Dana 60 housings are the same. I would stay away from 60 HD housing cores, however. They have extra casting webs, thicker tubes and are unnecessarily heavy.

Make sure you don't buy a Dana 61 either. These are most often found in late '70s-early'80s Ford trucks and vans. Although they look like common Dana 60s, gear ratios higher than 3.54, or (conical looking) offset carriers are dead give-aways.