The Plug, Rubber is the cheapest item from this partsfiche.
Of all the components used in this assembly the Gasket Kit,b (nas) is the most expensive.
With all the components that make up the CRF50F 2009 (9) JAPAN AE03-190 (JDM) EOP-2 assembly. The O-ring,6x1.7 is the most frequently specified with two applications.