On this parts fiche the Plate,clutch Friction (nas) is the most specified component.
Some items from this specific schematic: Spacer,25.5x47x2.5, Hub-clutch, Spacer,thrust,t=5.5mm, Rod,clutch.
The Zx400c2 1985 Europe Uk Fr Gr Sd Sp Clutch consists of nineteen pieces with the Housing,clutch,67t being the most expensive.