Looking for Stepside floor supports

[1971ChevyTruck]

I need a set for floor supports for a stepside with wood floor...had a perfect set and scraper took them....

[qksilver]

I think that the interchange is 55-72, and if that is the case I have a set but they are buried.
Before I use the time and effort to dig them out, find out if a set from a 65 step side will work. They came off of a truck I got out of Arizona, I broke the bed down so I could store it easier. It is a long bed step but the cross rails were perfect,minor surface rust only and I cleanly cut the spot welds on the back.
Pm me when you find out and we can go from there.
Thanks ,
Steve