Polyutherane control arm bushings.
I had them in my '66 Convertible Chevelle and HATED them.
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they are essentially a composite (teflon & polyurethane) bushing with a metal sleeve that has a zirk fitting integrated into it for continued lubrication.
They are fairly pricey if i recall, but many of the muscle car guys find them favorable to plain polyurethane.
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