In that last pic you can see the two c-channel bars coming straight out throught the lower plastic valence holes, where the stock tow hooks would stick out.  Then their is a 1/4 inch steel plate on top of the c-channels.  The entire thing is completely bolt on and can be replaced with the tow hooks again if I feel the need to sell the truck and take the winch.  You can click the pics for a supersize view of each.