On this parts fiche the Washer, Spring is the most specified component.
The Washer(6a1) is the lowest priced item on this Flywheel Magneto schematic.
A sample from the products for the Flywheel Magneto include: Coil, Lighting 2, Ybs66-4 Washer, Plain, Washer, Spring, Flywheel Magneto Assembly.