The most reasonably priced component used on the Vl800 Boulevard C50 2009 (k9) Usa California (e03 E33) Turnsignal Front & Rear Lamp (model K7/k8) is the Nut.
The twenty-two Vl800 Boulevard C50 2009 (k9) Usa California (e03 E33) Turnsignal Front & Rear Lamp (model K7/k8) component parts are all listed in this schematic.
Some items from this specific schematic: Cover,front Tu, Lamp Assy,fr Turn Signal,r, Nut, Washer(5.5x14x1.2).