OK, turns out it appears to be the inner bushings on my lower control arms. My mechanic said you probably can't just get the bushings because you usually wouldn't be able to press them into the control arm. Sure enough, I looked at the diagrams and they don't even list the bushing, so apparently I need to buy two control arms. Once again, cheapest OEM was BMW Parts Store for $160 each, and there are aftermarket ones ranging all the way down to $37.

Again, are there any aftermarket control arm brands anyone would recommend, or should I just bite the bullet and order OEM? Bav Auto has Lemfoerder for $120 and Meyle for $110. I have seen those brands as recommended on other parts.

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Tim in Indy
2014 xDrive35i