I haven’t found a great guide on installing the OEM Ford bug deflector/bug shield/hood deflector or whatever it might be called. I installed it on my 2013 F-150 FX4- and it turned out great.
The instructions that come with the deflector are about as great as Ikea assembly instructions- they were all photos.
First start by popping the hood, look for four nuts near where the grille meets the hood. You can safely remove them now. Then take the four L-brackets provided and just look at them and the grille for a minute. The brackets need to stick out through the grille(the threaded end should poke through.) Two in the middle are the full non cut brackets. The two on each side will have a small notch allowing them to sit correctly through the grille. To protect your paint Ford provides small plastic 3M pads – where the brackets come through the grille is where you will need to apply those 3M pads. Stick them in place and hand tighten the nuts back on holding the brackets.
At that point I installed the bug deflector hand just snugging up the four screws provided and trying to line up the deflector with the centerline of the truck.
Ford provides two more clips that will hold the corners of the deflector. I lined up these with the holes in the shield. Applied the provided 3M pads to my hood and snapped them on.
There are three cones that will support the deflector that still need to be applied. Line those up with the three yellow stickers on the deflector.
I bought mine from Amazon http://www.amazon.com/gp/product/B00D4AW82Q/