After looking in stores & making 3 bad purchases, I found that Wayfair had the exact size I needed for my new sink.  Unfortunately, I didn't account for the placentment of the circular opening.  I am quite frustrated, as my disposal is more toward the back of the sink and does not match that of my new grid.  I want to return it for one that size but with the circular opening where I need it to be...need help :-(