It is necessary for HID transforming some vehicles with spacers such as Toyota, Mitsubishi, Mazda, etc.
Please refer to the picture for compatibility and other information.
Toyota
Windam
Estima Hybrid
Kardina
Corolla, Levin, etc.
Mitsubishi
Galant
Legnum, etc.
Mazda
Capella
Familia S Wagon, etc.