'83-96 Bronco Tailgate in cross-sectional views
'78-82 is only different in the latches & interlock switch takeout, which comes off the motor harness near the center mechanism. For latch details, see this:
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The wiring harness is slightly different behind the taillight: early trucks have a large 3-blade connector for the window motor, and optionally a 1-blade for the defrost; later trucks' harnesses continue to a 4-pin connector inside the frame rail forward of the bumper. All with defrost have a ring terminal behind the taillight (G400).
