I picked up a tailgate liner part # 9L3J-9940726 AAW for 20 bucks, used but never installed for my 2011. I have the right installation screws as well. My question is: 1. Is this the right part? and 2. do I have to remove the tailgate cap to install or does this just sit over it? When I match it up the holes appear to be correct, but Im not sure if the liner tucks under the tailgate cap, and thats wher it looks like it might not fit. Any info appreciated