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I wondered the same thing. For what it's worth...I was at a WoO show, and looked at Sammy's car. I figured maybe bronze at the rear arms, plastic every where else. He doesn't pay for this stuff, and he is known for his lightweight cars.
He had bronze bushing all the way around.
That tells me that there is some reason he does not like plastic torsion bar bushings.
I prefer bronze myself because they don't seem to get egg shaped inside when they wear.
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