If you have one of theese, I need some advice. I am thinking they sent me the wrong one. I will try to explain it. On the existing grill, I will refer to the verticle platsic grill as "bars". I sat the billet grill over the existing grill and the holes on the billet grill where the screws go thru, are directly over the top of the verticle bars on my grill. I do not see how to fasten it on using the hardware provided as indicated on the instuctions. According to the instructions, it shows that the clamps are suppose to be placed at the top and bottom of the billet grill.
I did get the lower and it fits perfectly.

 

Disregard my last post. After further investigation, I discovered that you can not buy a one piece billet grill that fits over the top of "bar" grills like what the FX4 has. The one piecers will only fit over top of the honeycomb grills. The alternate is to buy one that replaces the inner grill.
Now I think it explains why all the grill trading I see going on, possibly.
(give me a little extra time to catch on, this is my first Ford)