Is one of your fog lights out, or are they looking dim? This Ursprung pack gives you two brand new 9005 (also called HB3) fog light bulbs. They're a direct replacement, so installation is usually a simple 'plug and play' job. Just pop the old bulb out of the housing (make sure the lights are off and the car is cool), disconnect the wiring harness, and plug this new one in. No special tools or modifications needed for most vehicles. Always check your car's owner's manual to confirm that 9005/HB3 is the correct bulb size for your fog lights. Having both fog lights working is not just about looks – it improves your visibility in bad weather like fog, rain, or snow. Keep a spare set in the garage so you're never driving with a light out.