Apparently you can make it work with a little modification. How bad are your floors? If they are thin with minor pinholes you can go to the store and get some fiberglass cloth and some fiberglass. Clean all the rust off, and lay fiberglass over the area. Makes a very strong and good looking repair.
Thanks Franklin2. I saw that thread but it didn't sound like anyone had actually done a second gen pan installation. I can get by with fiberglass on the passengers side but the drivers side would go a lot better with a pan replacement. I may go ahead and order a pan and see how it goes.
I would not be afraid to order that older panel. I just put one in my 84 Bronco II. That was the proper application and it still needed some hammer work and cutting to fit correctly. I am sure you could do some bending and cutting and make the older panel fit. That rib pattern in the middle of yours looks a little different. But I am thinking if you cut all your rib pattern out, the other panel would lay in there better after you did some bending and trimming.