Can't find inertia cut-off switch

Fule pump on my 1976 Spider Veloce 2000 does not work with the cut-off switch disabled. Does anyone know where in the US (or the wolrd!) I can buy an inertia cut-off switch? International Auto Parts informed me that the part is no longer available.

diavia the supply of air conditioner in italy the can help you.
ciao

Oops. Seems I missed this post first time round.

The principle of operation of an inertia switch, no matter who makes it, is the same; in the event of a crash, the switch opens an electrical circuit (usually to the fuel pump). This means that an inertia switch from any make of vehicle will work Ford comes to mind first).