Some Mazda vehicles require an adapter to use an HID bulb in their stock headlights, this will do the trick!
Because of the way the original halogen bulb clips into the housing, an HID bulb won't be a direct swap without these adapters.
It is recommended that you check your headlights for a similar looking plastic part socket behind the bulb to identify whether or not you need these. All housings would take H7 bulbs, the original part extends the +/- connector towards the electrical socket.
Slotted design allows the wiring for the bulb to slide in from the side, and then original clip assembly will hold bulb firmly in place just like stock.