[purpleRac3r]

The foam cover is a shared part with European and Asian export cars. Many of those countries require a tow hook or tow eye on-board the car at all times. The recess you refer to is for the tow eye. It would thread into a bracket behind the cover on the left lower rear fascia or behind the removable insert in the front grill, just to the passenger side of center in the upper row. Our North American cars do not have the rear bracket or tow eye, but we may have the needed hole in front behind the plastic valance behind the grill. I've looked for part numbers, diagrams, etc. at my dealership. We found diagrams showing these pieces, but apparently the NA parts ordering system doesn't have any numbers.