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I have three of them. One from/for a generally original '57 Bird with at least 3 previous owners.
One in a '55 Bird of fairly questionable origin. And another from an ebay vendor, advertised as a used '55/'57 T-Bird part.
All three are the same height, 7 inches, and appear to be the same.
They fit in the 2 Birds without any trouble.
As shown on the right side of your photo... all three have the 'flat' not perpendicular style seam holding the upper & lower half's together.
On all three, the small rectangular neck for the flex duct is approx 5/8 to 3/4 inch in length. Not what appears to be approx 1 & 1/2(+) inches on your example on the left.
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