In this schematic the "Bolt,socket,5x25" is used most often.
Parts such as the Generator/regulator ('79-'81 C2/: Rotor, Bolt-upset,6x25, Bolt,socket,5x25, Washer-spring,5mm are included in the Kz1000c4 Police 1000 1981 Usa Canada Generator/regulator ('79-'81 C2/ parts fiche.
The Washer-spring,5mm is the cheapest item from this partsfiche.