I think these Procar Pro90 seats are a pretty good match for the era, I’ve gone with a set of these in low back style for my 69 Hardtop (Dart) and have had the rear seat trimmed to match. For those that are interested I’ve also attached some pics of a 68 Dart using the Pro90s with headrests and a matched rear seat as well as the Scat subframe adaptor.