You'd be surprised how a box will change dimensions as you push on a corner. If your rockers and floor are welded in at the hinge pillar, you might consider cutting them loose to adjust to the dimensions given in the FAM.
Kevin 1951 Chevy 3100 work truck Follow this saga in Project Journal Photos 1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car) Busting rust since the mid-60's If you're smart enough to take it apart, you darn well better be smart enough to put it back together.
