The most reasonably priced component used on the Gl1500cd Valkyrie 2002 (2) Canada / Kmh Water Pipe/thermostat is the Bolt,flange,6x14.
On this parts fiche the Bolt,flange,6x25 is the most specified component.
Some items from this specific schematic: Thermostat, Case,thermostat, Sub Harness,eng, Cover Comp,thermo.