Rear wheel well liners
They're kinda a pain in the A$$ to install. Seriously.
They do look awesome, and will certainly stay put forever and ever, and
fit great once you wrestle them in there and get it all buttoned up.
I just installed the Ford liners on my 2012 FX4 (2+ weeks, 900 miles, and perfect so far !), and the instructions weren't that great. There are two additional plastic push pins, one on each side of the truck, holding edge molding in that you'll have to trim off to get the bottom bolts to line up on both sides. (Not covered in the instructions.)
I put the 2nd liner out in the sun to soften it up a bit, since wrestling, pushing, and cussing the 1st one into place was so much effort. Having the plastic as flexible as possible is a good thing.
The plastic it's made of is very similar to bed liner plastic, and seems super sturdy and durable to me. I even touched up a couple of paint chips underneath with flat black, and painted the bolt heads black to match the liner. Looks awesome, and it ain't moving.
Some people have said 45 minutes (?!?!?) to install them. I did the best job I could, and it took me about 2 hours. Removing the wheels would help quite a bit, if you can do that.


