GM alternator pulley: Did I screw up buying this??
Did I screw up? Pictured below is what I took to be a GM 3929387 alternator pulley. It in fact measures as a 3 5/8" diameter, is a machined pulley, in this case has no p/n stamped (which is I believe not un-heard of). To me there is something missing, though I could be wrong. Not to be a smarty-pants, but does anyone here see a problem with it besides me?
