Any seat will fit if you make up some adapters. I got some Daytona seats for my Jeep and they are really wide compared to a Duster's. I have some 89 Jeep leather buckets in my Demon while I recover the originals and those are great, size wise. I have the stock rails in and made some adapters.

If you are looking for bolt in including rails I have heard early 80's dodge Omni stuff is close.

Do you need rails?