Thanks Mark for the clarification. When my friend and I initially ordered them a couple years ago through our local distributor, all they asked was the make and model of our cars (89 325i) but was never asked about whether we needed 10 or 12mm ID bushings.
Can you clarify why on the GC site it says that these half moon style specifically says not for coupes or sedans and gives you a link for the "coupe" version where there's a picture of the RSM that has a full moon reinforcement?

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