I think those can be found in the wheel well also. They are a bitch to get out. Just pop them out with a flat head screwdriver. They are just clips.
I never found out how to get them out other than that, cause when you twist the middle with a screwdriver, it doesn't do anything.
Just pry gently.
naw, its not those. but...i ended up just cutting the plastic screws in half with a saw
. i now have the rear bumper off, and im about to take off the bumper sopport
prodject 2200 is on its way