If you take out the headlights, you have access to the inside of the bumper. There's the perfect place to put the ballasts. I screwed the ballast holders to the inner bumper, so I can take out the ballasts if needed and click them back into the holders. No stupid double-sided tape needed!
"Voorkant" means "Front" of the car. Not the best picture quality, but you can see it. You don't get it much cleaner than this.
I only had to drill one hole as there was already a screw on the bumper which I used for the other side.


