Hello
Unfortunately I can't find any info on how this box is attached. Quick release fasteners or does it have mounting holes in the bottom so the following product would fit?
https://www.galaxus.ch/de/s4/product/treefrog-roof-box-rack-22-dachtraeger-zubehoer-22824610
Thank you :-)

Question

Answer

There are 4 quick-release fasteners I bought together 
[Fischer Railing support TopLine](https://www.galaxus.ch/de/s4/product/fischer-relingtraeger-topline-dachtraeger-10045318)

Search

Question about Fischer Xtreme II

Hello Unfortunately I can't find any info on how this box is attached. Quick release fasteners or does it have mounting holes in the bottom so the following product would fit? https://www.galaxus.ch/de/s4/product/treefrog-roof-box-rack-22-dachtraeger-zubehoer-22824610 Thank you :-)