The O-ring,6x1.7 is the most widely applied product in the CRF50F 2011 (B) JAPAN AE03-210 (JDM) EOP-2 ( two times ).
The Eop-2 assembly is constructed from several parts from which the Gasket Kit,b (nas) is the most expensive.
Check out any of the eleven Eop-2 components enlisted.