With a quantity of two pieces, the Bolt,6x12 is the most used part in the GEAR CHANGE DRUM/SHIFT FORK(S) diagram.
Some items from this specific schematic: Rod-shift,8x58, Bolt,6x12, Fork-shift,2nd&3rd, Rod-shift,8x82.5.
The lowest price component in this Gear Change Drum/shift Fork(s) parts-list fiche is the Bolt,6x12.