In this schematic the "Nut,cowl" is used most often.
A sample from the products for the Headlamp include: Headlamp Assy, Washer(6.5x20x1.6), Washer, Bulb(12v5w).
thirteen components are shown in this Gsf1250sa Bandit 2009 (k9) California (e33) Headlamp exploded diagram.