Weber 63013 Charcoal Grate for 18.5" Smokey Mountain Cooker Smoker Weber 63013 Smokey Mountain Charcoal Grate for 18.5" Smokey Mountain Cooker Smoker 63013 Grate measures 15 1/4" Please visit Weber's website to ensure you order the correct parts for your specific grill. It is best to look up by serial #. The following link will also help you find the alpha numeric number. http://help.weber.com/schematics/#serial-number