55.2-59 58-59 Fleetside Brace location

[57FleetsideC4]

I was doing some measuring yesterday and I think the second brace from the front is in the wrong spot by 1". If I could get a measurement from a 58/59 fleetside swb truck from the center of the front brace to the center of the second brace of the bed that would be helpful. My truck is a bunch of other trucks so nothing other than the cab and doors are original. Thanks Steve