Product review (5 stars): It fits!
The item I received does not look like the one listed, but it works.

I was pleased that this fit my Insinkerator opening. The real way to replace a waste disposer splash guard is to remove the disposer unit and slip the new guard in between the drain and the disposer. This splash guard works just fine sitting above the ring that holds the original one in place. So for the time being, I have just snipped away the old one with scissors, and have this poked into the drain above where that was seated. The guard stays in place just fine, and I can take it out to wash it, unlike the other one (which was a disgusting, slimy mass of bacteria). I don't know whether I will even bother with the full install.