Parts such as the Rear Cushion: Bolt,soc 10x57, Dust Seal,17x24x5, Cushion Assy,rear, Bearing,needle (k are included in the Cb600f3 2009 (9) Australia / St Rear Cushion parts fiche.
The Nut,u,flange,10mm is the lowest priced item on this Rear Cushion schematic.
With two applications this Nut,u,flange,10mm is the most specified part.