cciyu 10pcs T5 17 74 73 1-5050 SMD LED Bulb Instrument Gauge Dash Indicator LED Light Bulbs w/Socket Yellow Replacement fit for 1996-2003 GMC LED Type: T5 1-SMD-5050 LED Chips. Mini wedge bulb socket fits a 3/8" or 9mm diameter hole Cross Reference: Replace Stock Number:17, 18, 27, 37, 58, 70, 73, 74, 79, 85, 86, 206, 207, 286, 306, 307, 308, 406, 407 & 2721 T5 wedge base bulbs. Compatibility: 1996-1997 1999-2003 GMC C3500 C2500 Suburban C2500 C1500 Suburban C1500 Savana 3500 Savana 2500 Applications: dashboard gauge indication bulb interior light If the LED does not light up, simply Rotating it 180 degrees (reverse the polarity)