Genuine Weber part #66754 Control Knob Kit for Genesis II LX (qty 2) Set of 2 "lighted" main burner control knobs for Weber Genesis II "LX" (model years 2017 and newer). The 2-7/8" diameter knobs feature a gray plastic body with chrome trim, translucent skirt for emitting light, a red position indicator and a rain boot on the valve stem shaft. The valve stem shaft extends 3/8" beyond the bottom edge of the knob.