Parts such as the E-13-2 Carburetor (xl125-1221069-): Screw Set B, Carburetor Assy., Cap,rubber, Chamber C, Float are included in the Xl125k4 U.s.a E-13-2 Carburetor (xl125-1221069-) parts fiche.
In this schematic the "Screw-washer,4x16" is used most often.
Check out any of the twenty-one E-13-2 Carburetor (xl125-1221069-) components enlisted.