So I got two sets of bed sides with rails and believe it or not the dimensions were not the same. Who would have guessed! were these a deal installed item?
I got a couple measurements before I compared it the other set of sides. but if there's something in particular you want, let me know.
This is the first hole from the stake pocket at the tailgate end.
http://67-72chevytrucks.com/vboard/a...1&d=1590235626