I removed months ago the foglights of the GLT (some moisture in one of the foglights), so I decided to open them, clean them and make it totally waterproof with silicone.
I thought it was maybe interesting to share some pictures.
Firstly, it's good to know that there are 2 screws for each foglight, and of course very very very rusted on that place. It's sometimes nearly impossible to unscrew them and the temptation is high to smash up the plastic surrounding (what I did
but I had one spare) 
The stupid screws... Use new screws after that and don't forget to put some grease on it
Broken... (left)
After that, separate the 2 elements: the one with the glass and the other with the reflector. For that, push very carefully on the 10 clips.
The 2 parts:
If you decide to remove the reflector, just pull it and unscrew totally the adjusment screw.
Here is what happens when you wait too long with a broken glass...
And here is the result when they are clean inside, much more shinning!!
And finally, somthing funny, there are 2 parts number for the cover. It's written in german and I don't really understand the diffrence, one is with a "punching", the other not... If someone can explain me that
Use silicone when you put the foglight together for a good waterproofness!
That's it!
