Gonna be done with Aluminum diamond plate, Not as thick as the original versions, but these trucks "should" be in retirement and pleasure cruise mode and not need HD protection.
But here's photos of the male die for the tailgate lip.
1986 F-150 Flareside 4x4, 351, 4-v, ZF5 speed. AC, Cruise, Tilt, Slider, Digital clock, Radio, Lariat seat, Pwr doors/locks