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OEM monoballs are always the best.
Aftermarket ones are unproven, in terms of both strength and durability.
What you found with the Superpro camber bushes, I could have told you the same a long time ago. In fact, if you look at my post history, I cover it extensively (both on the F30 forums as well as BabyBMW).
I'm in constant contact with Graham (CEO Superpro) and last I heard from him about a couple of months ago, their new LCA/UCA arm kit (with monoball) had already been manufactured and they would be ready within a few weeks to be released.
They've gone quiet since the COVID-19 hit Australia hard, so I assume there have been supply chain issues.
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