Parts such as the Thermostat - Water Pipe: Hose D,water, Tube,5x290, Band,water Hose, O-ring,themo.body are included in the Cx500t Turbo 1982 (c) Belgium Thermostat - Water Pipe parts fiche.
In this schematic the "Band,water Hose" is used most often.
The Bolt,flange,6x25 is the cheapest item from this partsfiche.