Mar-K - I have a 58/9 fleetside - the GMCPaul site sez 12 boards, but only shows widths for 10 - there is in fact 12, but the width pattern doesn't fit Paul's list either L to R or R to L - looks like the missing ones may be in the middle
the board widths on the bed I have does not quite match the layout I've seen other places, tho the chevytrucks.org has the correct number of boards in the note from a user, with slightly different widths than I judged mine to be, tho that may be because I took off the gap allowance when I recorded them - haven't started cutting the wood yet, so I'll have more info later
have tried to check your 58-80GMfleetside pdf and acrobat tells me its "damaged and can't be opened"
is there a way to identify your bed strips obtained thru a repro supplier? if they're yours, thanks for the excellent piece of oak they're attached to!
Bill