Product review (3 stars): Watch out for the measurements on this one. Although ...
Watch out for the measurements on this one.  Although the answered questions above, and the product material says that it fits a standard sink drain, I found this is perhaps a millimeter or two too big for my sink, and it causes the rubber to bunch.  Clearly not a correct fit.  I do have a different make of disposal, but there is a ridge at the bottom of the drain where the disposal connects to the metal sink bottom, and this is where the existing, cheap, corroded back-splash collar currently rests.