[sperry]

1st, DON'T DRIVE ON THAT STRUT! If one of those tore off, who knows if the other's are about to go. If those all shear off, you're going to have a *mess* on your hands the 1st bump you hit. If you have to drive the car, you need to get a spring compressor and steal the top mount off your stock strut and use that temporarily.

Then, while the strut top's off, see if you can't press the broken stud out and replace it with one from a stock top mount. If they're not the same, you'll need either a replacement stud, or a whole new top mount. You might be able to get a new top mount from the manufacturer if that bolt was stripped from the factory or something.

For future reference, those bolts only need about 15 ftlbs of torque IIRC. Air tools should *not* be used to tighten those! If you did hit 'em with the impact wrench, you might want to check 'em all out and make sure the rest are okay.