Yep, had me stumped for a while! Worse yet, I must gave suspected something the last time I did the brakes because I had new bushings in stock. Interesting, I went to put some more bushings in my cart for FCP and noticed that the super expensive BMW bushings include an optional 3rd one with what looks like built in plastic rails/sliders. Anyone tried those??
BTW I probably should have said the noise was "amplified," not so much "transmitted" by the spring in my previous post.

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1988 325is (purchased new) sold
2004 X5 3.0 2005 X3 2.5
2008 X5 3.0 (new to me)