The sub assemblies and components that make up this F-12 Seat (cb450 K3 K4 Cl450 K3 K4) include this Seat,double, the most expensive part.
On this parts fiche the Nut,hex 6mm is the most specified component.
A sample from the products for the F-12 Seat (cb450 K3 K4 Cl450 K3 K4) include: Bar,seat Stopper, Rubber,seat Hinge, Rubber B Seat, Catch Assy,seat.