The component with the lowest price in the TRANSMISSION ('82-'83 A9/A10) schematic is the Nut,14mm.
In this schematic the "Circlip" is used most often.
A sample from the products for the Transmission ('82-'83 A9/a10) include: 2nd Gear,output Shft, Sprocket-output,15t, Washer,plain, Gear,input Top,20t.