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The two prong plug near the brake MC is for the hood lamp harness; you may or may not have that feature. The odd-looking four pin, 2 plug affair is for the tilt steering wheel assembly: the red/blue wires there interrupt the starter signal if the wheel is not in the proper position.
Thanks, but I'll pass on the plug remnants. Glad you found the NSS/BU plug/harness.
That's for the turn signals on the hood itself. If you don't have that hood, the plug is left alone.
Many optional accessories access plugs and connectors that are provided on various harnesses; if the accessories were not ordered, the plugs and connectors on the harnesses are still there but unused. It was cheaper for Ford that way.