Parts such as the Ignition Switch: Spring-brake Lamp Sw, Screw-pan-wsp-cros, Switch,rear Brake, Bracket-switch,rear B are included in the Ex400a3 Gpz400s 1989 Sweden Ignition Switch parts fiche.
In this schematic the "Bolt-flanged" is used most often.
The Ignition Switch is made up of components including this Switch-assy which is the most expensive.