VW HID Adapters: VW HID Kit Adapters designed to accommodate rebased HID bulbs. Some Volkswagen Jetta vehicles use an adapter to secure the low beam bulb into place. When installing an aftermarket HID kit, vehicles that use these adapters will require you to modify the adapter in order to accommodate the power wires connecting the HID bulb to the ballast. This professionally modified adapter, enables you to easily install an HID kit in your vehicle, without having to modify the vehicle's stock adapter.