it will not fit, the frames on the 60-62 are wider then the 63-66.
I will politely disagree. I think that it will fit. I might have to eat some crow on this, but a fellow Stovebolt member measured the bolt holes on his 66 Stepside rear bumper. The inner holes were 31" apart (center to center) and the outer bolt holes were 15 inches outside the inner bolt holes.
I drug a 62 Stepside bumper home from the salvage yard and the bolt holes on my 62 bumper are the same as on his 66. (OK, well I got 31.25 " instead of 31").
I think using the proper bumper brackets will make it fit. The brackets ARE different because the frames have different widths.
