The really odd part is when I do a search on the 3964881 it ONLY comes back as a PS arm and is never listed for a manual and yet as can be seen in my photo, there is one mounted on a manual box.
Dave, I don't think the "M" stands for manual as doing a little research I am hearing of several different letters stamped there. On the 3964881 arm that I have that came in on the latest car there is no letter stamping at all.
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