Well, lets just say I have a few suggestions. After some abuse the side skirts took over 4 years and small differences in the holes it wasn't to bad actually. My ultimate suggestion for the front lip, don't use the standard plastic push clips, M8 1.0 with a washer on either side and a 1.0 pitch nut on the back side is win. The lip will be able to sustain high speeds and no longer falls off here and there going over bumps at like 10 mph. For the side skirts, I used what was there, the large plastic push clips with some epoxy...they probably won't ever come off (haha).