Product review (5 stars): Great for Old Disposals and Old Sinks
Perfect fit for old Sinkerator disposal.  Be sure to view description, measurement and suggestions from reviews to make sure it will work for you. The strainer is separate from the stopper.  The stopper sets down snugly into the drain without projecting up into the sink. Cheap price and so good quality I would never buy a "universal" stopper again.