I remember the earlier post. I have a 39 GMC with original metal floor. The floor width is 48 1/2 inches which is the same as 40-46 Chevy. The bed sides on my 39 GMC are 78 3/8 inches + or - while the bed sides on my 46 Chevy are 79 3/4 + or - so the wood floor kit for a 40-46 Chevy will work for a 39 GMC if you trim the ends to fit, but the length of the bedsides are different.