GTR Lighting 42mm CANBUS Festoon LED Bulbs: Perfect for interior dome lights, license plate lights, and anywhere on your vehicle. These LED bulbs will replace any 34 - 37mm Festoon dome light bulbs. These LED bulbs will replace 578, 211-2, 212-2, 214-2, DE3021, and DE3425. CANBUS Compatible: These bulbs have a built-in CANBUS integration circuit to work with any vehicle. If your car uses a CAN-BUS monitoring and control system for your original festoon bulbs, these will be a plug and play replacement install.