A sample from the products for the E-4 include: Bolt Knock 5mm, Bolt Flange 6x18, Spindle,cam Chain, Arm,chain Tension.
The most reasonably priced component used on the C50cm C50d C50s 2008 (8) Japan Aa01-170 (jdm) E-4 is the Bolt Flange 6x18.
The sub assemblies and components that make up this E-4 include this Chain,cam, the most expensive part.