I believe there are four per side. One under each cover, and one under each end cap. The end caps just pop off (snaps off) by hand. Takes a bit of side to side and muscle. I did the first one gently with a wrench or a flathead (don't remember) so I could figure it out how it works. Just snaps into place.is that 10mm bolt under the cutout on top of the rail? just one?
Roof trim also just snaps into place - which is why it was easy for some scalawag to steal one off of my car. No tools needed.