Mirage Drives have had alignment pins since 2012 to prevent incorrect installation of the Drive where the nose slips under the drivewell. Older boats don't have the recess built in to accommodate these pins, it is a common practice to cut them off when using a newer Drive in an older boat. So in your newer boat, you don't need the pins if you know how to insert the Drive by keeping the spine from tilting forward. Since you have one pin remaining, it will still align your Drive for you.
These pins have nothing to do with left and right placement of the Drive or your squeak. A little light oil or silicone spray on all moving parts should take care of the problem.
BTW, I have cut off the alignment pins on all my GT and 180 Drives so they can be used interchangeably in my 2010 Adventure and 2011 Oasis.