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 bucket seat with stationary, horseshoe shaped headrests. The covers cover over the headrest and all.
This seat has a 60/40 split bottom and bucket backrests with a folding opening console. The horseshoe shaped headrests are covered over at the lowest position.