The most reasonably priced component used on the Cbr600f Hurricane 1991 (m) Germany / Kph 50p Gasket Kit A is the Gasket,ex.pipe (nas).
The Gasket Kit A assembly is constructed from several parts from which the Gasket Kit,a (nas) is the most expensive.
Some items from this specific schematic: O-ring C Case, Gasket,head Cover (nas), Gasket,cylinder H (nas), Gasket,cam Chain (nas).