The most reasonably priced component used on the Vl800 Boulevard C50 2011 (l1) Usa California Canad (e03 E33 E28) Fuel Tank (vl800c E3) is the Cushion.
The most expensive part in this assembly is the Tank Assy,fuel(black).
Some items from this specific schematic: Tank Assy,fuel(gray), Gauge Assy,fuel Level Sender, Cushion,fuel Tank Rr Upr, Washer(8.5x33x1.5).