Thule Square Bar Adapter for Fairing Thule Accessories and Parts 853-7362
Thule Wind fairing | Subaru Crosstrek and XV Forums
Amazon.com: Thule AirScreen XT Wind Fairing, Black : Automotive
Put a wind deflector on, see If that will help with the wind noise. Had to make up some custom brackets as the Thule supplied brackets wouldn't fit OEM roof rack. :