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There is, or rather should be, a semi-structural piece behind this opening with 4 vertical thin bars that attach to this horizontal one, keeping it strait. Either the clips have failed or a body shop possibly failed to replace it if the truck has ever had front-end damage.
Part number is CL1Z-17D635-A
Amazon link:
https://www.amazon.com/Diften-105-A1045-X01-Expedition-FO1036122C-CL1Z17D635A/dp/B00OO1JJQW