On this parts fiche the Nut,u,flange,10mm is the most specified component.
Parts such as the Rear Cushion: Collar,cush Conn, Nut,u,flange,10mm, Bearing,needle (k, Cushion Assy,rear are included in the Cb600fa 2008 (8) Australia / Abs Rear Cushion parts fiche.
The Nut,u,flange,10mm is the lowest priced item on this Rear Cushion schematic.