The Fuel Tank 81 is made up of components including this Tank,fuel*pb-7c which is the most expensive.
On this parts fiche the Screw,oval,3x6 is the most specified component.
Parts such as the Fuel Tank 81: Cap,fuel Filler, Bolt,flange,8x25, Cush,fuel Tank Rr, Emb,r.side Cover are included in the Cm400a Hondamatic 1981 (b) Usa Fuel Tank 81 parts fiche.