The headlamp mounting rings for a '64 GTO are not "one year only". It is not smart business for GM to do that for a simple piece on a production vehicle.
Without getting into all 4 headlamp mounting rings for the '64 T/6 and T/8 here is just one:
Group 2.726 - Part 5948825
58 - 62 All (Lt. Inner)
61 - 64 T/6 - T/8 (Rt. & Lt. Inner)
63 - 64 P/8 (Rt. & Lt. Inner)
67 - 68 F/6 - F/8
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