Parts such as the F-21: Nut,hex Cap, Cushion Assy,rear, Cushion Assy,rear, Washer,10mm are included in the Z50j Monkey 2006 (6) Japan Ab27-170 F-21 parts fiche.
The Honda F-21 has ten products enlisted in the schematic.
This F-21 assembly utilises four Collar, Cushion(s) - the highest specified component.