I purchased and installed a new Toyota Matrix rack back in '09 on my new 2010 Vibe. After reading your question I went out and checked. No, not adjustable.

Special thanks to (Tonebalone) for posting his remarks & photos of the Matrix roof rack on his Vibe. My 2010 Vibe AWD is the same dark blue as his and the photos were very helpful in my research. I installed mine this morning. After being assured by two online vendors that the racks would fit bo...