The most reasonably priced component used on the Vlr1800t Boulevard C109r 2009 (k9) Usa California (e03 E33) Evap System (e33) is the Screw.
Some items from this specific schematic: Clip, Valve,fuel Tank Breather, Canister Assy,charcoal, Hose,breather Valve & Canister.
In this schematic the "Clip" is used most often.