Found a shop that would do the bushings for a reasonable charge, except they refuse to do the work because, "the control arm bushings have nothing to do with the vibration you're experiencing."
It would be nice to be able to test the bushing to see if they're bad, but I don't really know any way to do this while they're on the car.

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1999 E320 4matic really nice Wagon 135k
1981 300TD loud, rattling family car 180k (TGI sold!)
1985 500SEL gas guzzler 220k (sold)
1978 300D my first Turtlediesel (sold)437k