Parts such as the Cylinder: O Ring,69.8x2.0, Bolt,stud,6x45, Cylinder Comp., Bolt,flange,6x28 are included in the Cbx1000 Supersport 1981 (b) England Cylinder parts fiche.
On this parts fiche the O Ring,69.8x2.0 is the most specified component.
The Nut,flange,6mm is the cheapest item from this partsfiche.