Yes, rear shocks wer optional on trucks over 1 ton. Fronts mount the same, 1/2 through 1 ton, rears are same on 1/2 and 3/4 ton. You might look into copying the 3/4 ton setup and possibly use shocks from a '73-'87 1 ton, which usually include new upper studs. It won't be 100% corroct to what the original option would be, but it will be funtional.
