Parts such as the E-12: Fork,gear Shift, Bolt,nock,6mm, Pin,g/shift Guide, Spring,shift Drum are included in the Ca50j Jazz 2002 (2) Japan E-12 parts fiche.
This schematic depicts all components used in the Ca50j Jazz 2002 (2) Japan E-12 partslist.
Of all the components used in this assembly the Drum,gearshift is the most expensive.