Parts such as the Flywheel Magneto (rv90k: Lock Washer, Screw, .screw, 02112-04107 are included in the Rv90 1975 (m) Usa (e03) Flywheel Magneto (rv90k parts fiche.
The Flywheel Magneto (rv90k assembly is constructed from several parts from which the Magneto Assembly is the most expensive.