Parts such as the E-4: Valve,inlet, Bolt,hla.stopper, Spg,valve, Seat,valve Spring are included in the Gl1500se 1999 (x) Japan Sc22-110 E-4 parts fiche.
In this schematic the "Cotter,valve" is used most often.
The E-4 is made up of components including this Cam Shaft Comp,r which is the most expensive.