VW Automatic Window Regulator Clip Both Side Improved

This is based on the work of chuck : http://www.thingiverse.com/thing:11954
I remove some useless material to make is lighter, and mirrored it to have the driver's side. I made two versions, see below why.
Perfectly fits my Volkswagen POLO 6N1 1996
The freecad files are included, so feel free to improve it !

Please print it with the highest filling setting if possible (use files named XXX_Improved.stl or freecad project improved_model2).
If you cannot (or do not want to) print the part full you may prefer the reinforced parts with name ending with "holes". When printing in "medium" filling setting, this will create reinforcement points where the part needs it (else, it will break ...).