Well, just like the gauges, rear lights, etc., the interior is one’s personal preference. I’ve opted to use a middle seat frame from a Dodge Caravan instead of spending hundred of dollars on a special 32 ford seat frame. It may not function as nice as one of those special made 32 frames, but I’m not going to be using this roadster as a daily driver. And I rather spend the money on other things for the car. I’ve seen other roadsters with the Caravan seats and a good interior guy can work magic on those frame. So, it’s up to you as to where you want to spend your money.. The seat that I picked up was from a 2005 Dodge Caravan, it’s roughly 42″ width, so it will fit perfect in there the roadster.. I did make the mistake of buying another seat just before this one, it’s the three seater version, I thought I would cut it done.. But when you are talking about $40 for a seat, just not worth the time or effort to cut up a frame to make it smaller, when you can get another one that will fit fine for $40.
Side note: Seems that 2000-2005 Chrysler and Dodge mini vans all use the same seats, just be sure to get the 40-42″ one and not the 47″ one.