Mija L Kihei , HI November 25, 2017 Appliance: KitchenAid 15" Electric Ceran 2 Burner Cooktop KECC051HBL05 Kitchenaid Cooktop Kecc051hbl05: Glass top and knobs needed changing. How to replace Cooktop, Glass (Black). We ordered two knobs and new glass, they arrived as ordered and on time. Both items were in stock. Do-It-Yourself Rating: Repair Time Estimate: Less than 15 minutes