A basic set is the main portions of the seats, bottom and tops. For example:
There are exceptions to these statements but they are noted in the descriptions of each seat cover.
This seat is a 40/20/40 split bench seat with center seating and non-adjustable headrests. Seat Belt is attached to shoulder area of seat.
This seat is a 40/20/40 split bench seat with center seating. The area of non adjustable headrest is a curve rather than a 90 degree angle. Usually for ST model.