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.