i'm not sure that is for a 64.
the main give away is the circular rubber disc and the "pin" directly in front of it.
that reminds me of the 197? up jacks that are used in the bumpers that have slots in them that the "pin" fits into. the rubber disc then contacts the chrome of the bumper, protecting it from scratches.
perhaps there are numbers somewhere on the mechanism ? if so, maybe others can confirm or deny my A$$umptions ? shruggy
beer