Just curious, why not poly? Too hard?
I have used greasable poly bushings on other rigs with good results.
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Cause there is only so much flex in these trucks!
The rubber is one more place to HELP it flex, where poly is pretty stiff.
Poly lasts longer though, and greasable ones take a lot of noise from them.
I found mine by taking one of mine into a off road shop and started comparing them to what they had on the wall.
Thought they were off a CJ or YJ, or something like that. Can't remember now though, that was about 10 years ago.