The most reasonably priced component used on the Gs750n 1978 (c) Usa (e03) Starter Clutch is the Spring.
This schematic depicts all components used in the Gs750n 1978 (c) Usa (e03) Starter Clutch partslist.
A sample from the products for the Starter Clutch include: Piece,push, Roller(15x13), Clutch Set,starter, Spring.