If it is not original to the truck, it is either aftermarket or NOS. All of the aftermarket floor area patch panels are imported and, in my opinion, they are all, generally speaking, of the same quality, fit & finish.
If you find a cab, that you are prospecting for a floorboard, you would be better off using that cab, as your donor cab. Two-to-make-one, requires a tremendous amount of time and it would be a shame, to sacrifice a good cab, to save one with a bad floor. When they rust, the floor is, primarily, the first area, to begin showing evidence of rust.
