This part-list fiche shows all the components that make up the 190197 Rear Brake ('81 -'82 Kz750-e2/e3 .
A sample from the products for the Rear Brake ('81 -'82 Kz750-e2/e3 include: Shaft-caliper, Piston Seal Ring, Bolt,socket,8x30, Cap-breather.
In this schematic the "Bolt,socket,8x30" is used most often.