[Jonboy]

The earlier high back seats did not recline. The passenger side has a hinge, and the seat would pivot on that. Pretty sure those seats will interchange side to side if necessary to account for wear. Starting around 86 or so, they went to a fold and slide type seat, where the track stays stationary, and the seat folds forward and slides on the tracks for access to the rear seat. These seats have a reclining mechanism and cannot be switched side to side due to this. The top of the front seat is more rounded like you are describing. As far as I know, the rear seat design is pretty similar from 78 on, in that it folds and tumbles forward.