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It is just part of the pigtail that would attach to the military truck. Basically is a rubber block that has connections in it that you can't get too. You can see it in the video I posted in the post above this when I remove my military pigtail harness.
I wanted to share my video here as it may be helpful.
Also, here is what I found for wires with a 4 pin & 7 pin harness.
For a 7 pin harness;
Green goes to 21
Brown goes to 22-460
Red goes to 22-461
White is the ground
For a 4 pin harness;
Green goes to 22-460
Yellow goes to 22-461
Brown goes...