I tried the poly bushing thing on my '72 Porsche, and also on a '73 VW Thing that was used for off-roading.
Miserable experience, from installation to driving. I eventually went back to rubber. The squeaking and creaking drove me nuts. There was also a fair amount of 'stiction' when temperatures dropped.
I'd avoid it, unless you are in to punishment!
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Filmmaker, Dad, Citizen of the World in Asheville, NC
=== current vintage stable ===
'73 VW Thing, '09 BMW 328i Convertible, '07 Honda Ridgeline, '94 Chevy Step Van
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