I bought 21/21.5mm and 22/22.5mm heads at the same time. Like many modern cars, both my wife and my own F150 had terribly swollen nuts. The 21.5mm end of this socket easily fits the flared nuts on my truck. Based on my experience with my wife's truck, I would recommend buying a 22/22.5mm head at the same time. Your truck has almost four times the miles as mine, so its nuts take a lot more wear from my impact wrenches. The ring nuts were so swollen that I had to hammer 21.5's in on some of them, but I found the 22mm head fit easily and wasn't all around the hex. I would also recommend that you replace those pathetic excuses for nuts with solid nuts as soon as possible. I order the one offered by Eisen which is available from Revain and seems to be of good quality.
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