I am fairly sure (but its been awhile), that I was able to adjust the front one. The second one (smaller one) definately won't slide too far forewards. As I said in the quote, I'm not sure if it was adjustable. I think its made so that it won't come too far foreward. Try and adjust the front one. I'll measure mine, if yours won't adjust.sandman said:I haven't heard any wind noise either. However, the directions make it sound like you could if you mounted them to close together. One note about the rails - they are two different lengths. One is slightly longer to fit the back part. The front one was adjustable for maybe an inch or two. I don't think I could adjust the back.