A sample from the products for the Gasket Kit 1 include: O-ring,17.8x2.4, Gskt,cylin.head (mca), Gasket Kit A (mca), Gasket Kit A.
The fourteen Cb250rs 1980 (a) European Direct Sales Gasket Kit 1 component parts are all listed in this schematic.
The O Ring,10x1.6 is the cheapest item from this partsfiche.