I have a 2012 Outback which accepts the Yakima Landing Pad 12 adapters but I think they're still waiting on ones for the 2013. Are you carrying bikes or kayak or what? My Yakima trays work on the stock bars and my round bars.
I am considering buying a 2013 Outback. I too need to find a solution for carrying two 17' ocean kayaks in Thule/Yakima saddles on 48" crossbars. And, I want to find a way to mount the rear crossbar in the new Outback crossbar position. Any ideas are appreciated.