Figured out how to pull rivets for the seatback snaps. Uninstalled the bad one and then installed eight good ones. Seatbacks are done. Installed seat belts except for crotch straps, will do those next time the seat pans are off. Sanded main wheel intersection fairing then disassembled wheel pants and extricated the fairings. Sanded the cowl epoxy fill to be even with aft edge of air inlets. Safety wired right wheel pants bracket bolts.