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Someone asked but didn't get an answer so I'm posting for those that find this thread via google. To find the "code" for the factory installed bearing sizes (red/yellow (r) and blue/violet (b)) It's printed on the front of crank; specifically the front of the 1st counter-weight lobe. You can see the code once you have the oil pan off and before you remove the oilpump. Rotate the engine while having eyes on the lobe as it passes by. Removing the oil pump would be it easier to spot, but it's possible to see it before removing the pump. It'll be something like bbbbrr. The bimmerworld bearings have this info in the description and a photo as an example.
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