Cross Reference: Previous Part # 722421. For RANGE: Use Prior to Serial #17004636. Starting With Serial #17004636- The Entire Grate Must Be Replaced. For RANGETOP: Use Prior to Serial #11301782. Starting With Serial #11301782 - The Entire Grate Must Be Replaced. NOTE: ALSO USE FOR PAD REPLACEMENT ON CURRENT GRATES WITH SINGLE PAD AND 3 CAST POST. SINGLE PAD IS NON FUNCTIONAL AND SERVES ONLY AS A HOLE PLUG.