With a quantity of six pieces, the Bolt,flange,6x25 is the most used part in the THERMOSTAT diagram.
The most reasonably priced component used on the Cx500c Custom 1982 (c) Usa Thermostat is the Bolt,flange,6x25.
Some items from this specific schematic: Thermo Unit Assy, O-ring,13.5x1.4, O-ring,21.9x2.5, Case,thermostat.