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9/16" socket, if I recall correctly. Slide the seat back remove the two bolts hiding under the carpet flap. Move the seat forward and remove the two rear bolts.
From: The reason time exists is so everything doesn't happen at once
Re: How do I remove seats? (DaddyO)
With the seat all the way back remove the two fromt bolts. Then move the seat forward to remove the rear bolts. A word of caution; the nuts are welded to the floor pan, it they beark loose you will have to reach under the car to hold them while removing the bolts (long arms or a second pair of hands come in handy for this.)
Once the bolts are romoved the seat lifts right out, just be careful because the ends of the tracks are sharp and can easily tear the door panels or scratch the paint.