A sample from the products for the Headlamp Housing include: Nut, Cushion, Bolt, Spacer(6.5x9x11.5).
This Headlamp Housing diagram displays the required parts for the Vl800 Boulevard C50 2011 (l1) Usa California Canad (e03 E33 E28) Headlamp Housing.
In this schematic the "Cushion" is used most often.