The component with the lowest price in the OPTIONAL PARTS schematic is the Sprocket-hub,44t,al.
Parts such as the Optional Parts: Sprocket-hub,51t,al, Sprocket-hub,44t,al, Sprocket-hub,50t,al, Sprocket-hub,48t,al are included in the Kx60-b9 1993 Usa Canada Optional Parts parts fiche.
