When you install the bolts make very sure you apply a bit of Loctite to the threads.....especially if you intall with nuts up.
I mounted mine a couple of years ago like Roscoe has his (from the photos) wasn't smart enough to put on the Loctite....a couple weeks later I'm flying down the highway when all of a sudden the passenger side wing smacks against the inside of the winshield and lands on the floor...both bolts had lost the nuts due to vibration, bolts fell out ... luckily the wind wing came inside the car rather than being launched out onto the highway. No damage expect to my nerves. The noise startled the heck out of me
Remember to Loctite the nuts
I also changed from nuts up to nuts down