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If it were my car, I'd replace the whole cable, as it's not that big a deal. Second would be to drill/grind out the broken bolt stud and replace it. Don't cut the clamp off and replace it with some dime store cheapo clamp on piece, as your car deserve's much better than that. Maybe try some of those red/green anti corrosion terminal felt's next time. Not sure if they help much, but only a few buck's.
The nut on the terminal stud is "special" in that the bottom is tapered to provide the clamping action. To the best of my knowledge the nut is not available separately from GM. As advised above, your best bet is to replace the entire cable.
Please note the torque value for the nut embossed on the bottom of the plastic terminal cover(s). I don't recall what it is without looking, but it is important to stick to it.
Last edited by 9C1; Feb 4, 2010 at 09:19 AM.
Reason: torque note.
Designer Imagines A Corvette That Looks More Like a Corvette Than the Corvette
Slideshow: A Jaguar designer's personal project imagines what a modern front-engined Corvette might look like if Chevrolet revisited the golden age of the Stingray.