Well I was certainly confused on the question. Thanks @stephenVA for the diagram. I guess I was under the notion it was the rear ball joint that nobody ever replaces because it is so difficult because the BMW specific tool is def needed--just maybe not required.

At any rate, the "ball joints" that are in the "control arms" are usually sub assemblies that are non-serviceable. But I do think there is a way to service the rubber bushings in them sometimes.

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2003 BMW X5 3.0i -- MT5, 3.64s final gears, H&R lowering springs, K-Mac bushing kit
2007 BMW X3 3.0Si -- MT6