NA and NB seats sag and collapse at the outer bolster because the driver drops onto the same spot for decades and the foam simply crumbles. The cure ranges from a foam patch to a full reupholster, and you can do all of it on the bench.
The seat comes out with four bolts through the floor. Disconnect the seatbelt buckle and, on airbag-equipped NB seats, the side-airbag connector before lifting it clear
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