In this schematic the "Bolt 5x10" is used most often.
eleven components are shown in this Gsx600f Katana 2001 (k1) Usa (e03) Fuel Cock exploded diagram.
The most reasonably priced component used on the Gsx600f Katana 2001 (k1) Usa (e03) Fuel Cock is the Bolt(6x20).