The H4/HB2/9003 LED bulbs are commonly used in a wide range of vehicles, including many models from Honda, Toyota, Nissan, Mazda, Volkswagen, and including specific models like Honda Civic, Toyota Camry, Nissan Altima, Mazda RX-7, and Volkswagen Golf. These bulbs are popular because they combine both high and low beam functions into a single bulb, making them a versatile upgrade for various vehicles. With a precise beam pattern, it ensures optimal road illumination without blinding oncoming traffic. However, compatibility can vary by specific model and year, so it's always best to check your car's manual or search H4/HB2/9003 headlight bulbs for which cars on google to confirm compatibility before purchasing.