Parts such as the Seat: Collar,seat Mtg., Seat Assy.,double, Seat,double, Nut,hex 6mm are included in the Cm250c Custom 1983 (d) Usa California Seat parts fiche.
On this parts fiche the Rubber B Seat is the most specified component.
twelve components are shown in this Cm250c Custom 1983 (d) Usa California Seat exploded diagram.