Product review (5 stars): Great Price For This Whirlpool Vent Grill - Fits Well
This is a replacement for the original that the mounting tab broke on both sides when my wife tried to remove it without taking the screws out.  I don't blame her, but she should have asked me.  Anyway, this was a quick fix and my wife is happy once again.  It is an easy replacement.  It took a little bit of persuasion to fit in place, but it finally did.

My only complaint, I feel it should include the two screws for mounting the grill.