The Bolt 5x10 is the most widely applied product in the GS500E 1983 (D) GENERAL EXPORT (E01) FUEL COCK ( five times ).
Some items from this specific schematic: Plate,fuel Drain, Lock Washer, Gasket,fuel Level Gauge (nas), Screw.
The Bolt(6x20) is the cheapest item from this partsfiche.