#21 & 16 are the usual suspects for random toe changes in the rear. After that the rose bushing which you can change with a mini press is the next likely suspect. At the low mileage of you car even those are already unlikely. The bushing you marked is Powerball unlikely. If the eccentric is frozen, good old un-sticking is at hand not replace the whole part just the bolt perhaps and some patience.

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2011 E70 • N55 (me)
2012 E70 • N63 (wife)