66 Dart 270 Convertible

The front seat is a four door front seat, as you noted it will not fold forward for rear seat access. So you need either a two door bench or bucket seats. Many people have upgraded to seats from Sebring convertibles because they have integrated shoulder belts.
The convertible rear seat is specific to converts, it is narrower than the hardtop & sedan 2& 4 door seats.
I hope this helps.