The component with the lowest price in the SWING ARM/SHOCK ABBSORBERS ('81- schematic is the Nut,8mm.
On this parts fiche the Bearing-needle,hk2216 is the most specified component.
Some items from this specific schematic: Damper,shockabsorber,, Shock Absorber,rear, Nut,lock,16mm, Washer-plain,12mm.