Product review (4 stars): Some retro-fit was necessary
My old bracket that holds motor in place in the back was shorter than this one.  So, I snapped old and new ones off.  Easy to do, just being held on by pop rivets.  It won't come off at the rivets though, so don't sweat this.  Now, get yourself some super glue and glue old brackets to where it snapped off from.  I would mark the bracket in front with a magic marker just so you don't reverse them possibly throwing off alignment.  Also mark where the wires go, red in my case was the bottom wire, white being on the top.  Yours could be different though.  The ground wire was mounted in a different place but wire was long enough.  Now to strengthen joint, get yourself some epoxy and cement the joint where you broke it off.  Put everything back together when it hardens sufficiently.  You can run freezer without the fan for a little while, just make sure back of freezer is in place so it doesn't ice up coils.

You can also test fan prior to this modification by getting a old, cheap, extension cord, cutting off the end, stripping of the ends so you have bare wires and using alligator clips attach this to the fan.  Then plug into the wall to test out.

I rate it four stars because it is a good deal.  Compared to one that drops right in.  Bottom line, it works.  Maybe I would rate it three if I paid big bucks for it?