For those of you considering buying the OEM base carrier bars for your Q3, I have this to report. I just bought a pair and compared to most every other bars I've seen, these bars are quite wide, a little more than 3 inches across. They do seem to mount quite securely and I like that they don't protrude much out to the sides of the car. However, if you plan to leave these on all of the time be forewarned, they create considerable wind noise, more than other bars I have used in the past on other cars, and way more than I'd be willing to tolerate on a daily basis. I only plan to use mine on occaision.