Product review (5 stars): Fit Perfectly!
I tried the standard "fits most" from both big box hardware stores and had to return them all.  I was getting very frustrated.  Saw this on Amazon and voila!  Works like a charm.  If you have a Whirlaway disposal, it has a smaller opening than others.  Be sure to get one that states Whirlaway.

So happy!  Things are not jumping out when I turn the disposal on and its much quieter.

Super fast delivery - exactly what I needed at a very affordable price.

What more could you ask for?