I did this just this weekend. For light mounted in the rear spoiler. There are 4 screws to remove from underneath the rear spoiler first. You will need to open the boot door to see under neath. They have star shaped security heads so you will need correct driver set. Once spoiler is removed you then get access to the light unit in the spoiler and they also have 2 much smaller security head screws to remove. Ensure you don't loose the 2 plastic seperators that clip onto the top of the rear windscreen glass to protect glass from the spoiler.
Abdul M
February 2008