H7 LED bulbs may require lock base adapters. Lock base adapters securely hold LED bulb in a headlight. These adapters are vehicle specific, and there may be 2 or more adapters that can fit a particular vehicle make, so please check your vehicle and see how the bulbs are held in place before purchasing lock base adapters. If you need help selecting the right set, please email techsupport@hidvisioncanada.ca