The component with the lowest price in the REAR CUSHION schematic is the Nut,u,flange,10mm.
Parts such as the Rear Cushion: Cushion Assy,rear, Label,rr Damper, Bolt,socket 10x70, Nut,u,flange,10mm are included in the Cb600f Hornet 2009 (9) European Direct Sales Rear Cushion parts fiche.
The Rear Cushion is made up of components including this Cushion Assy,rear which is the most expensive.