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Excellent post
05/2008 is when they made the change officially, though some 2008 m3's built into november/december still have the older routing. Though this is rare, it's worth noting you need to check the belt routing before ordering the pump. I replaced my PS pump and got the correct pump the first time. Didn't have to change anything else.
I confirmed with my BMW parts guy and there is indeed 2 different part numbers for each rotation direction.
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2014 M5 6MT 
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