The most reasonably priced component used on the Gs750n 1979 (n) Usa (e03) Contact Breaker (kokusan) (gs750b) is the Lock Washer.
This schematic depicts all components used in the Gs750n 1979 (n) Usa (e03) Contact Breaker (kokusan) (gs750b) partslist.
Some items from this specific schematic: Washer 5mm, Bolt, Clamp, Plate,ignition Timing.