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I just got mine and they have 5 studs, I am too lazy to walk outside and pop the cap off mine and check, but I am pretty sure it is 6 lug. This is a 97 Expedition 2wd.
Thanks fellas, I freaked for a second, but checked the next day. It is just a PITA cause I have to put a dab of silicone on each hole so the damn center caps would stop falling off, I lost 3 before doing this.