Replacement parts question

Hi, I recently purchased a Renegade (yay!) but, not
so yay is that the dealership didn’t tell me a piece
was broken and by the time I got it home, the piece
was completely split and dragging in the back. I
cannot for the life of me figure out what the
replacement piece is called or if it’s possible to
replace in my own. To best describe, it is the plastic
molding underneath the rear bumper that kind of
covers the underskirt of the back of the vehicle. Any
ideas?