I have bought some from this guy several Times.  Gerry

http://www.greensalescompany.com/

Lake Forest California  5th inf 77 Armor Div. VN 68/69

If you put your town and state in your signature

help might be closer than you think.

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