On this parts fiche the Roller,4x11.8 is the most specified component.
A sample from the products for the E-16 Gearshift Drum include: Fork,r.g/shift, Drum,gearshift, Pin, Shift Return, Spg,shift Drum.
The component with the lowest price in the E-16 GEARSHIFT DRUM schematic is the Bolt,hex 6x25.