On this parts fiche the Unavailable In Price Book is the most specified component.
Parts such as the C - D - I Magneto: Ybs67-5 Washer, Spring, Screw, Pan Head (686), Unavailable In Price Book, Washer, Plate (517) are included in the Xt500 1981 Dual Purpose Usa C - D - I Magneto parts fiche.
The component with the lowest price in the C - D - I MAGNETO schematic is the Ybs67-5 Washer, Spring.