For Ford Fusion 2007-2018 H7 H11 LED Headlight HI/LO Beam Bulb ComboPack of 4

How to choose the correct size? 1.To confirm the size in your original user manual or by checking the original bulb's back. 2. To search in webwith automotive bulb look-up and find out the bulb size. 3. Contact customer service to check the vehicle model. Neither side lighting up? Both sides flicker, flash, or work inconsistently. Check the headlight fuses, and then check the ballast plugs to insure correct installation. If this doesn't work, there may be a voltage problem with the vehicle. You probably just need a relay or capacitor. One 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)Please check your connection and fuse. 4)If still could not help, please contact our customer service, we will get back to you within 48 working hours.