Of all the components that make up this Headlamp the Washer(5.5x18x1) has the lowest price.
The sixteen Gsx1300rz Hayabusa 2001 (k1) Usa (e03) Headlamp component parts are all listed in this schematic.
This HEADLAMP assembly utilises four Washer(5.5x18x1)(s) - the highest specified component.