I used a hellwig on the back of mine. It was one that clamps on. It worked allright until one of the clamps fell off when I was driving. I must of had the stereo cranked up, cause I didn't hear it fall off. I wouldn't recomend that brand, but would definately recomend getting a sway bar. It helps a lot.
LOW68
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http://www.geocities.com/a68rod