Duster Bucket Seat rails HELP??

As it turns out I bought these seats on e-bay, FIRST MISTAKE! They were advertised as a 70's Mopar seat for Duster, Dart, dart Sport. When I got them, almost a month later, the rails were all rusted stiff and I had asked the guy how the rails were. I was told they were in very good shape, NOT! After a couple of cans of WD40 and alot of work, I got them moving and actually got them apart to find that both of the tracks with the locking handle were missing the roller assembly. Once I check the rail against the car the bolt pattern will not match the holes in the car. Any rate, I just got the seat apart today and found a build sheet in the passenger back cushion and had some questions. The Body Broadcast sheet has a box called model. In that field there is a model entry of 77 is this the year of something else? I do not have a problem rebuilding these seats but I do need to find out what they are. Can anyone help.