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Do you mean the bolt with the little ball on the end? If so, you should be able to get them from the dealer, or aftermarket ones are available on Amazon, Ebay, Liftsupportsdepot.com. Just make sure any aftermarket ones are actually meant for the LS430.
just get the aftermarket "strongarm" ones off Amazon. they are great, cheap, work well, and they come with the ball joints to completely the replace the old ones.