Prothane's kit is for the old style V6 control arms, Energy Suspensions kit covers everything post mid 01 and up. There is a set of four banger control arms that do not have a prothane option.
The crappy arms have a rubber bushing that gets strapped to the subframe, no metal retainer. You can't upgrade these in any way (different subframe and all).
The early V6 arms have a peg that sits in the big bushing but no nut on the end of it, no insulator sleeve. If you have these, use Prothane's kit.
The late model arms have a nut on the end of the peg that goes through the bushing and a sleeve inside the bushing. If you have these, use Energy Suspension.
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