This happened to me on a japanese car, so I don't know if it would be applicable. I simply drove the car (slowly) on the remaining functional lug nuts to the nearest Big-O tire store and they installed a new lug nut for me in 10 minutes. $2.50 for the lug bolt and nut, and $20 labor. I recommend calling your local tire store - they break lug bolts all the time. They should have ideas.-jim

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jimSF