Of all the components that make up this Starting Motor the Bolt,flange,6x55 has the lowest price.
Parts such as the Starting Motor: Bolt,flange,6x55, Cover,st Mag Term, Circlip In 32mm, Motor Assy Starte are included in the Nx650 Dominator 1997 (v) France / Cmf Starting Motor parts fiche.
On this parts fiche the O-ring is the most specified component.