The front bumper brackets come in I think three flavors.
1) non tow hook, just a mount for the bumper
2) Mild (my term) tow hook brackets, like the non tow hook, but with a little more material and holes for the brackets - I have these that I picked up from a junkyard - I don't really trust them. They don't extend back past the stock mounts and have no lateral stabilizers.
3) Tow Hook brackets - These are the ones you want if you don't want to bend your frame and want the hooks to be able to do anything. The extend way futher back than the bumper brackets, into the wheel well. They also have lateral stability brackets that help spread the load.
All that said, there are very strong arguments for just getting a front mounted hitch. Better load spread across the unibody if you get stuck, and some have tow "rings" at the ends.
Check out Rusty's or the C4x4 aftermarket brackets too. If you have to replace the brackets anyway, go for these or the OEM tow hooks.
