We used to use polygraphite (urethane impregnated with graphite) bushings on some of our street rods. Performance Suspension Technology in New Jersey ( I think). Their tech. guys used to be willing to try to find the oddball mod. for us. The advantage of the polygraphite over the regular polyurethane was... no squeeks! Doubt if they would have a drop in part, but maybe there is a muscle-car near match. For what it's worth.

Edit: found their #. 973-299-8019

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The Golden Rule

1984 300SD (bought new, sold it in 1988, bought it back 13 yrs. later)