Check out any of the eleven Kick Starter Spindle (st50c/j/k/l/st70c/k) components enlisted.
In this schematic the "Set Ring,20mm" is used most often.
A sample from the products for the Kick Starter Spindle (st50c/j/k/l/st70c/k) include: Retainer,kick Spg, Set Ring,20mm, Pinion,starter, Washer, Thrust.