I don't believe the fairing will fit on the aero bars, the parts that attach the fairing to the bars are molded specifically with a round hole in them. I would suggest getting the Yakima crossbars, it is a super strong setup and allows you to add on other attachments very easily (bike attachments, kayak stackers, etc) In the long run it doesn't cost too much more because in order to get the ski/board attachment to fit on factory bars you have to buy specific mighty mounts anyways.
Hope this helps