I saw a post below about neutral safety switches and remembered that 3 were available from the following link. These are 1958 Ford NOS neutral safety switches that are supposed to start in park and/or neutral. The picture of the switch looks right, I am not sure about the Part Number. They are $55.00 each.They should also fit 1955-56-57 Fords.
http://www.fordrestorationandparts.com/store/1958/1958-ford-neutral-switch-nos