Does your mast have a threaded end so it can unscrew from the base? That's what is used on my Bonnevlle. Acccording to my 1961 parts book it is "part #520124, group 9.647, Antenna assembly - manual (57" long)". I cross referenced that number to the PY online parts database, and it says that mast fits all Pontiacs from 1955 through 1964, so hopefully that works for you.
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