This GASKET KIT A assembly utilises four Seal Valve,stem(s) - the highest specified component.
Some items from this specific schematic: Gasket,cylinder H (nas), O Ring,10x1.6, Gasket,cylinder (nas), Gasket,exh.pipe (nas).
The most reasonably priced component used on the Cb250 1999 (x) France Gasket Kit A is the O Ring,10x1.6.