For 2020 2021 Silverado 1500 WT Custom Trail Boss 6000k LED Headlight Bulbs

How do I choose the right size? 1. Check the size in your original owner's manual or on the back of the original lamp. 2. Search the web with "automotive bulb look-up" and find out the bulb size. 3. Contact customer service to check the vehicle model. Plug&Play quick installation. Designed to be smaller than standard LEDs on the market without the need to build an external driver, they plug directly into the factory housing. Neither side lights up? Both sides flicker, flash or work inconsistently. Check the headlight fuses and then the ballast plugs to ensure they are correctly installed. If this doesn't work, there may be a voltage problem in the vehicle. You probably just need a relay or capacitor. One side does not work? 1)Please reverse the polarity of the defective bulb and try again. 2)Please swap the bulbs from side to side and see if this solves the problem. 3)Please check your connection and fuse. 4)If this still does not help, please contact our customer service department and we will get back to you within 48 working hours.