Mystery wire in headlight harness

@1969383S This is why I go through the wiring in all my old cars. Well... all 3 of them so far.

I got under the dash last night to do my rewiring (moved the horn to the headlight harness, moved the starter trigger wire to the engine harness), and I found this little guy:
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Turns out (after much research and a trip to see our brothers over on B-body, who had the answer), these are the reverse light wires for the 4 speed (mine was white and black, not purple and white). Evidently you are to take them out of that plastic housing and slip them into the bulkhead connector. So I did... and they LIKED it!