The component with the lowest price in the GEAR CHANGE DRUM/SHIFT FORK(S) schematic is the Bolt,flange,6x12.
Some items from this specific schematic: Drum-assy-change, Gear,reverse,21t, Bolt,flange,6x12, Roller,4x6.
With two applications this Screw-pan Head,6x14 is the most specified part.