Yes, it will! The Thule Motion XT Rooftop Cargo Box item # TH629806 will have no issue mounting to square crossbars like the Malone item # MPG201. The only concern would be the rear hatch opening. You need to have the front crossbar 51-1/4" from the line where the roof and hatch meet for it to open fully.
If you're just using the crossbars for a cargo box, I recommend going with the shortest ones available for your Outback which would be the 50" item # MPG201. If you are wanting to throw... view full answer...
Hey KJ, so the bow/curve you have in the factory crossbars of your Mazda is very common and wouldn't be an issue at all with the Inno Wedge roof cargo box part # INBRM864MBK that you referenced. view full answer...