91538 Control Knobs Kit for Weber Summit E-470/670, S-460/470/660/670 Series Gas Grills 2012 and Later Models genesis ii 400 if your orginal grate is

if your orginal grate is 18 inch

Do Not Fit Weber Spirit 300 Series With Front Control Knobs

S1007012E016

so it is 13

91538 Control Knobs Kit for Weber Summit E-470/670, S-460/470/660/670 Series Gas Grills 2012 and Later Models genesis ii 400 if your orginal grate isCompatible with Weber Barbecue Grill Models: 2880001, 291001, 291101 292101, 293001, 293101, 294001, 294101, 297001, 297101, 298001, 298101, 7160001, 7170001, 7171001, 7260001, 7270001, 7271001, 7291001, 7291101 , 7292001, 7292101, 7360001, 7370001, 7460001, 7470001, 77460001, 77470001, 77471001, 77160001, 77170001, 77171001, 77260001, 77270001, 77271001, 77360001, 77370001, 77371001, 9291001, 9291101, 9292001, 9292101, 9293001, 9293101, 9294001,