Insert H4 halogen bulb into headlight

Step 7:
With the temporary plug out of the way, you can install the halogen bulb. There are three extensions coming off the edge of the housing of the bulb. The bulb can only be inserted one way, WITHOUT taking up the slot where the retaining clip locks into place. Neither of the three extensions on the bulb housing should go where the retaining clips fall into place.
Once the bulb is in place, lock the retaining clip back into place.