The most reasonably priced component used on the Cb450k3 Japan E-1 is the Screw,flat,5x12.
Check out any of the thirty-eight E-1 components enlisted.
Parts such as the E-1: Advancer,spark, Gasket (mca), Washer 16 Mm, Oil Seal 18x28x6 are included in the Cb450k3 Japan E-1 parts fiche.