I agree with Rick that it's for air conditioning, but I don't think the bracket in the pic is correct. I looked for a long time for the correct bracket as they weren't available as repop, or the repop was not even close to correct. (I can't remember which) I finally found one on a 69 Impala in a junk yard.
I think the correct one is wider, and has 2 reinforcing ribs near the edges. The corners are also cut at 45 degrees.
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