I curse people who put HIDs into reflectors... Just saying... It can cause massive accidents... Rather get a good Phillips crystalvision or similar.
As for the bolts behind the arch-liners, take one wheel off, put that side of the car on an axle-stand, and fully lock the other wheel inward. Peel back the arch liner, and sorted. I just hate the fact that Renault use a metal bolt into plastic thread... *facepalm*