Q towers are Universal. Clips are for specific cars. We have the correct clips, and with the measurements set to spec it didn't work. If you tighten the little knob all the way, the clip feels tight, but the tower practically hovers over the roof.
We solved it, though, buy moving the rear towers in a half an inch.
If anybody finds this post while trying to install one of these racks, the "M3" measurement (space between rear towers) should be 40", not 40 1/2".