Product review (4 stars): Does the trick
Our old disposal guard had deteriorated and was starting to look like a mold factory. I was nervous about cutting away the flaps of the old one as others had recommended but went ahead and did it. I couldn't completely remove the outer portion where it attached to the walls of the disposal, but cut as much of it as I could. The new piece dropped right in place and fit perfectly. It's a great improvement over the yucky old one.

It works fine; the only reason for 4 stars rather than 5 is because if you're expecting it to be an exact duplicate of the original splash guard, it isn't. But it does the job and was easy to replace.