The eleven Gsf1200 Bandit 2004 (k4) Usa (e03) Headlamp Housing (gsf1200k1/k2/k3) component parts are all listed in this schematic.
In this schematic the "Cushion" is used most often.
The component with the lowest price in the HEADLAMP HOUSING (GSF1200K1/K2/K3) schematic is the Washer.