On RealOEM it shows:
11427634292 for N20 up to 1/2012
http://www.realoem.com/bmw/showparts...=11&fg=30&hl=6
and
11427566327 for N20 from 1/2012
http://www.realoem.com/bmw/showparts...=11&fg=30&hl=7
Damn, I wonder if they are interchangeable or not...