Wire tuck help - what is this for?

Working on a wire tuck on my 93 GT. Any idea what this harness is for? Looks like a plug/harness but doesn’t plug into anything from what I can tell. Trying to figure out if I can eliminate it or if I need to extend the wires so I can tuck it and keep it.
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This is what the O2 harness connector looks like.

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Does the connector have a plug in the end of it?
What I'm looking at doesn't have any sort of harness or plug. The wiring comes out of the main harness at the firewall but the "plug" isn't really a plug, as nothing can plug into it. Who knows what the previous owner did and this thing has a full Terminator X system on it so I'm sure a lot of stuff was eliminated along the way.