Factory Bumper sag brackets?

[4play]

I had a look behind my rear bumper and i found these. do we all have them? http://i50.tinypic.com/x2ngc5.jpg

[ImpalaSlayer]

yes, but nothing in the middle, which is where it sags.

[4play]

oh, ok then lol, i just remember seeing police cars and taxi's with those tabs hanging down, just thought maybe they did not have them... too much off roading i guess.