The extra main beam bulb is fitted inside the headlamp's larger cover.
Applies to cars with Xenon headlamps*.
Detach the headlamp.
Remove the cover.
Unplug the connector from the bulb.
Detach the bulb holder by pulling it straight out.
Replace the bulb and fit the new one in the socket. It can only be secured in one position.
Reinstall the parts in reverse order.