I'm not sure what rear end you have, but the bolt pattern from at least the '37 trucks up to our '94 chevy pickup all have the same bolt pattern. If you get a rear end from a pickup from the late 60's or 70's, make sure it comes out of a 4wd. Otherwise it will have the 5 lug axles.

55 2 dr 210- after college project
56 2 dr 210- after '55 project
"D'oh"