The most reasonably priced component used on the Vl800 Boulevard C50 2011 (l1) Usa California Canad (e03 E33 E28) Second Air is the Clip.
The twenty-four Vl800 Boulevard C50 2011 (l1) Usa California Canad (e03 E33 E28) Second Air component parts are all listed in this schematic.
A sample from the products for the Second Air include: Hose,2nd Air Valve Rr, Bracket,2nd Air Sprt, Hose,2nd Air Cleaner, Clip.