It seems my bumper was taken off the car carelessly - and the wiring was ripped out of the bumper cover & broken away from the car body.

I have this side of the wiring - the part that sits in the rear bumper cover and provides sockets for the rear side markers and license plate light.
Slope Font Rectangle Automotive exterior Parallel

Wheel Automotive tire Tire Automotive lighting Toy

I need the part that inserts into the largest plug above.

This plug is what I need. It comes FROM the car body, NOT the bumper cover.
Wood Bumper Finger Household hardware Metalworking hand tool

From what I have read the plug needed is part of the whole body wiring harness. All is I need is the plug, plus about 6" of the wire, so I can splice it together.