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My '71 also had a round knock-out in that spot. In fact I accidentally knocked it out when removing the part. Had to have it tack-welded back in place.
I just recently learned that older models had square front light brackets (the turn signal lights, I mean).
Metal or plastic for the blackout light? (maybe that's too nit-picky)
Edit to add a pic: what the heck are these double-front marker lights? (above the turn signals)