The lowest price component in this E-16 Water Pipe - Thermostat parts-list fiche is the Bolt,flange,6x22.
Of all the components used in this assembly the Thermo Unit Assy is the most expensive.
This schematic depicts all components used in the Vf500fii Interceptor 1984 (e) E-16 Water Pipe - Thermostat partslist.