Hmm... Didnt think of that. Has anyone seen these for sale on the web? I searched but could not find them anywhere. Could be because i'm not exactly sure what that piece is called.
It's called a bumper extension. Or bumper end.
1996-2002 Toyota 4Runner Bumper End - Body Mechanical & Trim - Action Crash, Left - Driver Side 96-02 4Runner Bumper End - 7919-04016594 - PartsGeek
That looks like it could be "pulled out" by a dent repair place.
I would try to find a local guy who can do it.
Ive always heard it is extremely difficult to effectively remove a dent from chrome. For 54 dollars for the extension I dont see a local guy being any cheaper even if it could be done.
The Toyota oem part is much more in price. But may look and match better if your dented piece is still the factory piece. I spent a little over 800 for all factory parts less the two rear center brackets.
When I was looking for replacement parts when wife got rear ended I found zero positive write ups on the cheep aftermarket parts. All were poor ratings. Thin metal, poor chroming, back side of bumpers started rusting right away. Etc....