In this schematic the "Cap,grip Heater" is used most often.
Some items from this specific schematic: Grip Heater Sw, Grip Heater Kit, Cap,grip Heater, Heater R Grip.
The most reasonably priced component used on the Cb600f2 Hornet 2001 (1) European Direct Sales Kph Grip Heater Ss/on-of is the Cap,grip Heater.