Product review (5 stars): Perfect Replacement for Kitchenaid Disposal at half the price
This fit perfectly and is basically the same part as my Kitchenaid stopper.

I was actually looking for a replacement gasket for the Kitchenaid sink stopper and didn't know this(below) would have worked for half the price!

 LASCO 39-9009 Rubber Replacement Gasket for Garbage Disposal Stopper LASCO 39-9009 Rubber Replacement Gasket for Garbage Disposal Stopper