Parts wanted - switch part, horn, seat bracket, panel clip and gas bottle vent

Hi all, few parts are missing to allow me to finish my bus resto. The insert for the headlight pull switch that shows the light icon, original horn, the L shaped seat bracket that the base of the passenger seat clips into (the walk through side of a RHD bus), the metal vent that fits in the floor of the gas bottle cupboard and the U shaped galvanised metal channel that the interior panel fits into over the rear nearside wheel arch (about 3ft long?).

It is a 1973 RHD Westy Continental. If you know of anyone breaking such a vehicle please let me know.

Many thanks.

Fronk.