In this schematic the "Cap,grip Heater" is used most often.
Parts such as the Grip Heater Ss/on-of: Grip Heater Kit, Heater L Grip, Cap,grip Heater, Heater R Grip are included in the Xl600v Transalp 1999 (x) Switzerland Kph 50t Grip Heater Ss/on-of parts fiche.
The most expensive part in this assembly is the Grip Heater Kit.