I recently did a DIY dent repair on my rear bumper and noticed that parts of the foam reinforcer and metal reinforcer were missing. It's probably from the impact that caused the dent, but I was wondering if any of you guys had any idea about possibly replacing the part? And if so does anyone know what that specific part is called?

Thanks in advance!

PS: I just recently got the car and the dent was there beforehand so I have no real details on what the cause of it was.