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I believe the 987 halogen headlights do use projectors. In that case, it's probably the bulb location that's incorrect.
HID bulbs are typically longer than halogen, meaning that you may have moved hot spot of the bulb out in front of its ideal location. Try running the headlight on a workbench and slowly pull the bulb out of its socket a bit and see if the projected light pattern gets better. If it does, you need a spacer between the bulb and socket.
Use caution: the bulb is quite hot and the voltage is high. Use appropriate personal protection safety gear.
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