If not mistaken, the 65 Parisienne, Laurentian, Strato Chief, Impala, Bel Air and Biscayne share the same wheels with the 64. Just the center cap is different between the Chev and Pontiac through the 3 model lines.
So 65 and Chevrolet crossing might help you widen your search.
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65 Laurentian post, 67 Grande Parisienne 4 door HT.
Is the base of the 64 not a different size than the 63 column?
Will the signal light switch of a 64 wheel work for a 63?
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63 Parisienne sport coupe (The Big GTO), black, maroon interior, 409 4 speed; former owner of a 59 El Camino, 63 Corvette SWC, 62 Chev Bel Air SC. 1963- Pontiac top selling car in Canada
Mahone Bay, NS Still not old enough to need an automatic