The Ring,snap is the cheapest item from this partsfiche.
A sample from the products for the Cylinder Head (front) include: Plug,spark(dpr9ea-9), O Ring(d:1.9,id:40.7), Plug,spark(x24epr-u9), Plug,spark(dpr7ea-9).
The Cylinder Head (front) is made up of components including this Head Assy,cylinder Fr which is the most expensive.