Hey mate.
Use open rollers for the bearings, or purchase OEM and remove the seals. The sealed ones work fine, but why keep oil out of where it's needed.
Crank work in the US.. I'm not the man to answer the question.
Re balance, my research led me to believe that you'll never get a single crank balanced. You just move around the area that they vibe. Stock is fine. A well trued crank though will be friendlier across the board. Find someone who'll get it as true as possible and then be kind transporting and installing it.
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