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Positive. You can confirm on realoem.com - Z4M transmission splines are 22, E46/M3 are 10. Z4M uses GS6-37BZ transmission, E46 M3 uses 420G or whatever it is called. Also, I have an email from ACT, they do not make clutches for Z4 or Z4M (same trans). That website has wrong information - 2009 E86 doesn't exist either.
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