Parts such as the Cylinder Head Cover: Plug.6mm Hex., Socket Bolt,6x18, Cover,cyln Head, Rubber, Mount are included in the Gl1500c Valkyrie 2000 (y) France Cylinder Head Cover parts fiche.
The Rubber, Mount is the cheapest item from this partsfiche.
On this parts fiche the Plug.6mm Hex. is the most specified component.