ANSWER Hello, these risers do not require specific bowls. However, the three risers have varying diameters, and are able to be used on either end for greater versatility. Riser #1 has a 4" top diameter / 6" bottom diameter. Riser #2 has a 5" top diameter / 7" bottom diameter. Riser #3 has a 6" top diameter and 8" bottom diameter. As long as the bowls/plate you are using are larger than these diameters, they will work. Thank you!