With four applications this O Ring,13x2.5 is the most specified part.
The lowest price component in this Water Pipe / Thermostat parts-list fiche is the Washer,plain, 6mm.
Parts such as the Water Pipe / Thermostat: Bolt,flange,6x35, Gskt Con Cap, Pipe B,water, Hose B,water are included in the Vf1000f Interceptor 1984 (e) Usa California Water Pipe / Thermostat parts fiche.