I actually just installed mine yesterday. Got it from lmc. The bottom of the stock valence has a bunch of tabs that point backwards, and 2 bolt holes, one at either end. The lip has slots that line up with the tabs, and bolt holes at either end that keep the whole thing in place. Strangely though, the 2 outermost tabs didn't line up, so I ended up having to cut half the tab off. Other than that, super easy.