This CAM CHAIN assembly utilises two Screw(s) - the highest specified component.
The most reasonably priced component used on the Gsx550es 1987 (h) (e02 E04 E21 E22 E25) Cam Chain is the Screw.
A sample from the products for the Cam Chain include: O Ring(d:2.4,id:20.8), Spring, Cushion,cam Chain Tensioner, Chain,camshaft Drive.