A sample from the products for the Clutch include: Nut,20mm, Cam-release, Spring, Washer,22.2x34x4.5.
In this schematic the "Plate-friction (nas)" is used most often.
The most reasonably priced component used on the Klf400-b5 Bayou4004x4 1997 Usa Canada Clutch is the Nut,8mm.