Somebody told on board you could try lace the clip with small cord or nylon and get it trought the front hole to pull it out with it. I could reach it with my arm thought. Not easy!
Thanks for the picture Nacho and yes, round hole in the previous question.
As far as the first hole, I too, couldn't get that sucker in and isn't easy. After spending over an hour trying to get my arm in there, to find that hole, try to push it through, I put one of these on for the first hole and done.
http://www.clipsandfasteners.com/Push-Mount-Cable-Tie-For-Imports-200mm-Length-p/a20380.htm