Those are 14mm hardened studs, I also find it hard to believe that they would snap taking off a stock wheel. Did they show you that it happened before or after they mounted the A/M wheels? I'm with Hummertech that they probably tried to impact on the wrong thread pitch lugnuts, snapped them off, then tried to BS their way out of responsibility.
Dave
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1999 AMGeneral H1 6.5TD BLACK Wagon e-Lockers Front and Back, Rubberduck4x4 RockTubes, Extended Undercarriage Protection,"Big Duck" 2" body lift/2 1/2" suspension lift, 41" IROK Radials on 17" Cepeks w/Rock Rims, (in process)Centered front diff, 3.08 gears, 12k Brakes and 12k halfshafts
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