The fifteen Gsx550es 1983 (d) (e01 02 04 06 15 16 17 18 21 22 24 25 26 34 39 Seat Tail Cover (model D) component parts are all listed in this schematic.
Some items from this specific schematic: Screw, Carrier, Sports, Tail Cover, Seat, Tape Set,seat Tail Cover.
The Lock Washer is the lowest priced item on this Seat Tail Cover (model D) schematic.