The most reasonably priced component used on the Gs500f 2008 (k8) Usa (e03) Camshaft - Valve is the Bolt(6x12.5).
A sample from the products for the Camshaft - Valve include: Shim(22x30x1), Shim,tappet(t:2.75), Camshaft Set,intake, Shim,tappet(t:2.25).
The Camshaft - Valve is made up of components including this Camshaft Set,intake which is the most expensive.