cciyu 10x Mini Bulbs Lamps Replacement fit for GM Speedometer Cluster Backlight Lighting 12v-14v 95ma (10pcs) Diameter:4.7mm ; Operate Voltage: 12-14V, 95ma Application: Perfect for Speeometer Cluster Backlight GM automatic heater controls: 2003-2006 GM full size trucks and SUV's with automatic heater controls only, they will NOT work for manual controls. 1997-2004 Buick Park Avenue, LeSabre, Regal &amp; Century with automatic heater controls only. 1997-2004 Corvette with automatic heater controls only. These bulbs will have to be soldered to the PC board. You will have to completely disassembled the Cluster to get access to them. The blue socket can be discarded when using these bulbs. Please NOTE: If the LED does not light up, simply Rotating it 180 degrees (reverse the polarity)