I'm confused as heck. If you have the truck, you just measure that truck you have? You buy a floor and fit it in or cut sheet metal to weld in a new floor. Really not sure what you are doing? Cardboard template is usually the best start. Are you patching. Did the owner cut out the spot welds or hack it all upi?

FYI, to save money, sections are available from $30-$70.

Right is right, even if everyone is against it, and wrong is wrong, even if everyone is for it. - William Penn