6pcs 2016 2017 2018 LED

to choose the correct size? 1. confirm the size in your original user manual or by checking the original bulb's back. 2. search in web with “automotive bulb look-up “and find out the bulb size. 3. customer service to check the vehicle model. & . with smaller size than the common LEDs in the market without building an external driver, directly plug into the factory housing. side lighting up? sides flicker, flash, or work inconsistently. the headlight fuses, and then check the ballast plugs to insure correct installation. this doesn't work, there may be a voltage problem with the vehicle. probably just need a relay or capacitor. side could not work? 1)please turn around the plug (swap the polarity) of the defective bulb and try again. 2)please exchange the bulbs from side to side and see if the problem could solve. 3) check your connection and fuse. 4) still could not help, please contact our customer service, we will get back to you within 48 working hours.