A sample from the products for the Fuel Cock (model X) include: Clip, Cock Assembly,fuel, Bolt(6x20), Spring.
The Suzuki FUEL COCK (MODEL X) has seven products enlisted in the schematic.
The most reasonably priced component used on the Gs650gt 1981 (x) (e01 E02 E04 E15 E16 E17 E18 E21 22 24 25 26 34 Fuel Cock (model X) is the Bolt(6x20).