I'm sorry, neither of my Pontiac parts books (58-66) or (58-70) have a diagram for the 63 headlight assembly. Then I went to the assembly manual on microfiche and it doesn't even have it!
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1966 Strato Chief 2 door, 427 4 speed, 45,000 original miles
1966 Grande Parisienne, 396 1 of 23 factory air cars