Dirtman, the style inertia/rollover switches used by FoMoCo are readily reset and do not need replacement if they are operated manually. Inside the switch are two contacts with a steel(?) ball bearing of good size sitting on top, touching both contacts. When disturbed by inertia or rollover, the ball moves off the contacts breaking the circuit. The button just moves things around to let the ball fall back into place. Nothing is damaged or changed in any way by the switch opening. Go to a boneyard and take one apart, or take yours apart and have a look.
tom