After a bit of searching I think I was able to answer my own question based on info from this thread: http://www.m3post.com/forums/showthr...filter+adapter
The MS adapter is simply the 08/09 piece so there is no reason to replace it as it should be identical to what is already on the car. In 2010+ BMW went to a shorter nubbin and lengthened the filter by adding a small piece to the top (see above thread for photos). Other than these "nubbin" bits the 08/09 and 10+ airboxes are identical.
Now if I could only figure out the power steering pulley torque spec so I can install my UD pulleys..