Parts such as the Cylinder Head Cover: Gasket,head Cover (nas), Bolt,flg.soc,6x42, Bolt,flg.soc,6x32, Cover,cyln.head are included in the Cb650sc Nighthawk 1983 (d) Usa Cylinder Head Cover parts fiche.
In this schematic the "Bolt,flg.soc,6x32" is used most often.
The Cb650sc Nighthawk 1983 (d) Usa Cylinder Head Cover consists of four pieces with the Cover,cyln.head being the most expensive.