The master bushing kit that Prothane and Energy suspension sell do not include the bushing on the lower compression arms. Those bushings must remain rubber because it twists on 3 different axis. Urethane can't twist in that many directions without tearing out. Your best best is to just replace the whole compression arm. The Mevotech brand arms are $150 from www.autopartswarehouse.com. They seem to be a much nicer quality than the eBay arms.

I wouldn't skimp on suspension components. That's just me though.

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