Swollen Lug Nuts
The definitive answer on the strange lug nuts for some 2010-2011 Fusion/Milan cars. These leg nuts have two functions; to hold the wheel at a torque of 100lbs and snuglyhold the suspended wheel cover. The lug nuts have a beveled end for the wheel and further up the nuts a ridge to act as a retainer for the wheel cover. That is what makes these so unique. They are steel with a chrome cap, which always rusts and swells. These are hard to find and way more expensive than other chrome ones. The replacements are Dorman 611-306 and range in cost for 20 from $100 to $180. I had to replace all 20 of mine recently as my lug wrench would not go over the swollen nuts. And on one of the new ones the cap fell off and the store replaced it. Crappy design Ford and crappy manufacturing Dorman. The pictures are of the whell cover, online prices, and the defective replacement nut cap that fell off. BTW: other companies use the chrome cap method too vs solid and they all rust and swell.