rear seat pan

I have this stuff. Differential pan from a 76 Scamp. The diff pan is the same for Dodge and Plymouth. Foot wells are 76 Dart.
Maybe you could use these for repair sections. Plymouths don't use the foot wells as that is how the longer wheelbase is achieved
in a Dart.

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The top one's front edge is what i need in a Plymouth the dart floor is More 90 degree and has them two big humps in it buy the shaft Tunnel my Duster has more a 45 with out humps