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.
Buckets seats with adjustable headrests and an armrest on the interior of each seat. Side impact airbags are accommodated for.
Bucket seats with adjustable headrests. 1 arm on inside of driver backrest. Side impact airbags are accommodated for.