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I believe a simple female bullet type wire connector will work fine.Don't remember which is for the backup,sorry. 
The early cars before the three post nuetral switch and a switch on the colum for the back up lights. The center post is the nuetral switch and the other two are for the back up lights on the later cars. There are two different lengths of the center post switches for the early and ancient  cars, what year is yours?
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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