The component with the lowest price in the REVERSE GEAR schematic is the Cir Clip,ex.20.
On this parts fiche the Bolt,flange 6x32 is the most specified component.
A sample from the products for the Reverse Gear include: Brg,ndl.20x24x17, Shaft,rvs Shifter, Dowel,pin,8x14, Gear,rvs Idle.