The Roller,6x10 is the cheapest item from this partsfiche.
Parts such as the Transmission: Oil Seal,40x62x13, Washer,thrust,24, Gear,m/shaft 5th, Washer,thrust,28 are included in the Cbx1000 Supersport 1980 (a) Australia Transmission parts fiche.
On this parts fiche the Washer,thrust,28 is the most specified component.