Some items from this specific schematic: Heater R Grip, Cap. Grip Heater, Grip Heater Sw, Bracket Sw.
The Grip Heater Custom's is made up of components including this Grip Heater Kit which is the most expensive.
The most reasonably priced component used on the Vt600c Shadow 1998 (w) Australia Grip Heater Custom's is the Bracket Sw.