The Gasket 8.2x14x1 (nas) is the lowest priced item on this Cylinder Head Cover schematic.
twenty components are shown in this Gsx600f 1990 (l) (e01 E02 E04 E15 16 17 18 21 22 24 25 34 39 53) Cylinder Head Cover exploded diagram.
In this schematic the "Bolt(7x17.5)" is used most often.