the board widths appear to have differed in different series, so you might have to break it down by year series in about 3-4 pages - most years had 3 different lengths of stepside, and then after 58 there's 3 lengths of fleetsides as well, to 72, but the board widths will be the same
the only way you'll collect the information for the whole range of pre-72 is to find it at one of the places that sells bed wood like
Bruce Horkey or
Mar-K - even then the individual truck may not match the "established" pattern - the short fleetside I'm working on had different widths than those 2 sites specify, and while the overall width comes out the same and the number of boards is the same, use of their boards would not match the holes in my cross-sills
Bill
Bill