cciyu 10 pcs Twist Sockets 17 37 70 Instrument Panel Cluster Plug Lamp Dash Light Bulb T5 Dimension: W2.1x4.9d - Subminiature Wedge . Mini wedge bulb socket fits a 3/8" or 9mm diameter hole. Cross Reference: Replace Stock Number:T5 17,18,27,37 ,57,58,70,73, 74, 79,85, 86,206,207,286,306,2721. Application: Replace the light with T5 base, such as side markers, running lights, corner & bumper lights, license plate lights, instrument cluster, gauge bulbs, dashboard and factory housings. Please NOTE: If the LED does not light up, simply Rotating it 180 degrees (reverse the polarity)