Of all the components used in this assembly the Cover,cylinder Head is the most expensive.
Some items from this specific schematic: Cover,cylinder Head, Gasket,cyl Head Cover No.1 (nas), Gasket,cyl Head Cover No.2, Bolt(7x17.5).
The most reasonably priced component used on the Gsx1300r Hayabusa 2006 (k6) Usa (e03) Cylinder Head Cover is the Pin.