I am getting ready to replace the rear half the floor in my 91 LX, which is cracked and separated from the rocker panel. I plan on replacing the pan from the front seat mount to the kick up for the rear seat. Can I use a floor section cut out of a 1994-2004 Mustang? They are easy to come by in junk yards here, where foxes are few and far between (and when you find them they either crashed or rusty).
I just did the rear sections in my 86. I got one full side cheap at mustangs unlimited before they went out (cut the section I needed) and used one from Classic 2 Current for the other side. It took a little more “fitting”, but I got it done, and this was pretty much my first welding project
I liked the fact that they were selling just the rear part, so it saved me a few bucks.
I realize that doesn’t answer your question, but figured I’d throw that option out there.
Here is a pic of the piece before I welded. There are splits where I circled. You have to do a little fitting and bending, and then weld those seams up. But if you’re not looking for OEM, I’d say it was worth it.
I also saved some money by drilling out the spot welds and re-used my seat mounts..... if yours are still in decent shape.