In this schematic the "Bolt" is used most often.
This Cock Assy,fuel is the most expensive of the items that make up this Fuel Cock assembly.
The most reasonably priced component used on the Gsx550ef 1986 (g) (e01 E02 E04 E06 E17 E18 E21 E22 E24 E25 E34) Fuel Cock is the Bolt(6x20).