One thing to watch out for is if you have relocated the fuel tank from out of the cab to between the rear frame rails - the in bed filler on most ready to install tanks (mine included) is centered - there is no easy way to center a plank using the standard dimensions. Mine was done many years before I bought it - the installer chose to relocate a 7 1/4 to the center, the 5's against it - cutting differnt widths to come back into balance with 9 (ROUGHLY as you will need to make sure you have correct gaps between bolt and wood - 4 1/4, 6 1/2, 6 3/8, 5, 7 1/4, 5, 6 3/8, 6 1/2, 4 1/4) instead of 8 planks - which also required drilling new holes in the cross sills. Looking underneath I am sure he chose to do it this way so that he was not trying to drill a new hole halfway in an existing! Could have gone down to 7 planks - then rather than need one more metal strip than is in a kit you would have 1 extra! - BUT the wider the plank the more likely to warp!
personally I would have stayed stock dimension and just cut a squared door type filler in rather than the round cool cap on center.
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