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Here check this thread some else posted. Pretty good pic of location. 1968 A body Z bar frame Bracket

Redfish must have been typing the same time as me but beat me posting. I do agree it may already have a reducer.

You might be able to drill it and tap it to the diameter of the shifter. As far as what it's from your guess is as good as mine. My brother did have one on his 71 Duster.