That is cheap Tom. What wattage are the bulbs?
Here's the instructions from Alan:
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Read it a couple of times, it will make sense :O)
OK, take the bulb, pull the low voltage red and black wires from the grommet. Cut the remainder of the grommet off.
Install the bulb (most 993's require a minor amount of filing of the hole to remove any 'flashing' left behind when casting)
Now take a small file and make two 'notches' at the top of the light where the cover fits on. The cover has a gasket on it so there's no chance of it leaking even if water could find its way in there.
Go to Halfords, pick up 2 x velcro patches. Velcro the ballasts on the inner wing under the carpet so that all the wires face the LARGE grommet that goes through the wing.
Now find something hard and finger size and lubricate well with lubricant of your choice - open up the grommet and feed both the HIGH and low voltage wires through to under the wing.
We're going to wire the ballast directly into the 12v feed for the headlights. This means that when the headlight is removed you only have to undo the high voltage wires and should you ever need to put a normal bulb back in, the power is still in the headlamp for you to do this.
Twist the multi plug socket that the headlamp plugs in to 90 degrees and pull out. The bottom right pin and the one above it have a yellow and brown wire in them - this is where you connect the red and black wires for the power.
Connect the HID bulb wires to the ballast (under the wing) and turn the lights on to test (you don't need to re-install the headlamp to test it.
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