Hi, I just spent the day trying to replace my front fog lights (from underneath) but it does not look like what I found in forums, it is not just to remove cables and turn the bulb like described. I have a big black rubber cover and under that the cables are fixed and nothing can be twisted and removed as far as I can see. What is that I have here, some replacement? I have a European 2002 C5. Please see attachment.
-- forget this I found out it was a regular halogene H3 bulb.--

 

Good post. You did a good work and offer more effective information for us! Thank you.
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What I am getting is that you are trying your best to replace the fog lights. This is not an easy task to replace them perfectly as there are many technicalities associated with them. It is in your favor if you take help of a technical person for such kind of an issue.