You can get a custom made floor pan for any vehicle from a metal workshop/ classic car restorer, but it would be very expensive. I found a site that sells plymouth used parts at (jimazparts) says he has a full front floor pan for 76-77 auto, same body. You could aslo get part of the floor board that you need and weld it in, goodmarkindustries sells patches/foot wells.
Other options would be to:
1. look on aspen/volare forums like fmjbodiesonly for someone parting one out.
2. get a similar reproduction floor pan and cut and insert filler strips of metal to make it fit your body, an example use an A-body or E-body pan and cut it up and make it fit.
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