The component with the lowest price in the OPTIONAL schematic is the Screw.
This OPTIONAL assembly utilises five Screw(s) - the highest specified component.
Parts such as the Optional: Pin, Nut, Washer,lock, Washer(15.5x26x2.3) are included in the A100 As100 Ac100 1969 Usa (e03) Optional parts fiche.