Question about Fischer Xtreme II

The roof box is generally compatible with crossbars, and compatibility depends on the type of attachment. The Thule WingBar Evo has an upper T-profile with QuickAccess, which allows easy attachment of accessories and is compatible with a wide range of accessories. These features make the roof box compatible with the Thule WingBar Evo, provided the crossbars are correctly fitted and the attachment points match. The hooks on the box are adjustable, which makes it easier to adapt to different carrier systems. A 100 per cent guarantee can only be given through a practical test or consultation with the manufacturer.