It looks like the outline of some sort of metal (rust) bracket. Also, did you look for any remnants of a wiring harness or splice to power the lights?
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1979 2.3 Turbo Pace Car
1989 5.0 LX Convertible
1993 5.0 LX SSP (Nevada Highway Patrol)
2018 2.7 F-150 XLT 4X4 Supercrew
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