Parts such as the Clutch: Plate-clutch,t=2.3 (nas), Hub-clutch, Spacer,25.5x47x2.5, Bolt,upset-wp,6x20 are included in the En650dhf Vulcan S 2017 Europe,middle East,africa Clutch parts fiche.
The component with the lowest price in the CLUTCH schematic is the Washer,12x18.5x0.5.
On this parts fiche the Plate-friction (nas) is the most specified component.