Rear Burner Assembly, 20-1/2", Cast Iron, Burner Head, Gasket, Venturi, And Air Shutter., Burner Head Only # 24-1043, 8 Sides~, 1 Slot, 2" Ctr Mount., Air Shutter, 2 Windows, Single, .468" Hole, # 26-1569, Gaket Only # 32-1024, Rear Venturi & Air Shutter # 24-1132, Garland / U.S. Range