I have a question I am not able able to answer, I am looking for a back-up switch for my 70 mav with a C4, locking,and with the shift on the column, but the column is from a 72 or newer. It has the switch with four wires, I assume the other two are for neutral safety, so my question is the part number is D0DZ-15520- has different letters a-c-f- which one is the right part ? I know one is for a three speed on the column, but which is which? I have been looking on line for the answer but haven't found it. Thanks,
