75 Duster Neutral Safety Switch... I need to replace it!

You sure it's not your starter? What happens if when you turn the ignition? If if goes click each time, or even nothing, what happens? If you resist the urge to touch and move the shift linkage or mess with the lights, and just keep turning the ignition on and off and on and off - does it turnover eventually? If so, it's probably a bad comm on the starter. If not ... then it's probably your linkage as mentioned.