Ruckin69 wrote:Good info and point well taken. But out of curiosity will they still work by putting a bump side on a dentside and regards to holes and dimensions?
Some will interchange yes. It depends on which year bed and frame you are going to use. During the 73-79 years the frame width changed. However, even if you get a wide frame bed, it will still physically fit on an older truck (even a bump side) you'll just have to drill new mounting holes in the bed.
The long bed that came with my 77 crewcab project truck was off a 79 and they drilled new holes to fit the High Boy narrow frame.
My truck is a '75 body (narrow frame 34") on a '78 frame/chassis (wide frame 37"). Whoever did the body swap welded on some small tabs to bring the mounting point in 1.5" per side. It caused problems with the gas tank as they hammered in the corners and that caused it to break/rust. I've cut off those tabs now and replaced that gas tank with a new one.
But it can be done...
One way that this question becomes very useful is when thinking about using an older stepside on a newer frame, they have the same styling from '53-79.