ok I'm looking for replacement seat covers for my 63 4dr. I have seen vinyl but I have not seen any like the set in my car. At the moment just making a list of where to find and prices.
You don't get ready-made original-type covers, you get original material (see here for a Dart 170, here for a Dart 270) and have a good auto upholstery shop rework the seats with bolstered springs, new foam, and covers made of your new material or something similar they already have on hand.