On this parts fiche the Roller,4x14.8 is the most specified component.
The component with the lowest price in the GEARSHIFT DRUM schematic is the Roller, 4x13.
Parts such as the Gearshift Drum: Stopper Comp.,gea, Coller,shift Drum, Fork C,gear Shift, Gear Shift Assy are included in the St1100 1993 (p) Australia / Kph Gearshift Drum parts fiche.