For safety - original bench or switch to bucket?
In fact, 74 to 76 Dart Special |Editions and Valiant Brougham 4 doors sometimes had high back bucket seats with a steel lock attached to the seat back and base to prevent them from folding forward, and center "buddy seat". I used a set from a Dart Special Edition in my 1970 Dart, simply removed the locking bars and installed release levers