Power,
When the 64 1/2 came out it too had the vents. Yours might of been done many moons ago. Also, they never came with clearcoat.
Possiblity, since you have been all over car. That some one has removed the cowl completly and fabricated one complete and spot welded it back in.
Look in any "coffee table" book of Mustangs and you'll see that they all had them.
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