Installed on an '06 Porsche 911 and I have the 44" AirScreen. I mention this because I couldn't find a fitment guide on the Thule website. I wanted to cover as much of the "legs" to the rack as possible for maximum effect. The endmost mount bracket is 7" from the end of the AirScreen, so that might help you determine the correct length for your car. I mounted it on a round Yakima bar and needed to add some "filler" rubber behind the back of the strap for a tight fit as the strap does not have enough ratcheting "ribs" to pull tight on the bar without the added rubber. It works great! I like that the AirScreen has a lot of adjustment to get it positioned just right, unlike competitors. It is sturdy and well built and has decreased the wind roar by about 80% and the whistling by about 100%. Apologies for the poor photos - just couldn't get the light right.

I bought this to reduce noise from my roof racks. The installation is horrible. The strapping mechanism is poorly designed and nearly impossible to get tight. The toothed straps are difficult to pull on around an aero bar - they are not flexible enough to shape tightly to the bar. And the locking button that locks the ratchet in is impossible to hold down with your thumb. I felt as though I was going to dislocate my thumb trying to keep enough pressure on the stupid button. You cannot tighten the strap unless this super stiff button is depressed. Add to that the tough angle reaching across a roof and around the roof bars and it is simply ridiculous. This is a bad, bad, bad, bad design. Even the videos I have watched on independent reviews demonstrated the straps were not tightly conforming with the bar. One said you have to use a pliers to depress the button and another to pull the strap through. Try that on the roof of your car without dinging or scratching something. So disappointed and majorly frustrating. Pretty cool wind deflector but extreme fail on the mount. Some posts recommended replacing the straps with a strong UV protected cable tie. I may go that way. This mount sucks. Avoid unless you don't mind using tie wraps to replace the unworkable Thule straps.