I transfered the Thule 450 Crossroad Foot Pack and 50" load bars from my '04 Outback to my Sports roof rails with no problems. The front 50" bar works with about 1.5 inches sticking out on both sides, enough for the end caps to fit on. The rear has a little more excess. I'm running a fairing as well, and I have not noticed any harm to MPG. Getting about 2 MPG above EPA estimates for city and highway driving like a normal human. 5-speed.
took some picture this morning at dawn so sorry about the quality, but they should get the job done to give an idea..