Chuck,
The jacks parts are mostly generic GM from what I can gather. Mid 60s a-bodies likely have the same post, base, and jacking mechanism. The snap in part the rests on the bumper will be specific to Skylark.
Skylarks had both type posts. The "T" style and "tube" style. There are two handles, one for steel wheels with 3/4 lug nuts, and one for chrome wheels with 13/16 lug nuts.
Mark