Question about Montblanc Carrier Super Rider+

I have an older (2s) model of Montblanc and am looking for the instructions for it. The Montblanc head office was unfortunately not very helpful.... There is no information on the carrier like model number or anything. The model I have is similar to the Super Rider sold here, but instead of straps it is fixed to the car with metal elements. Does anyone have any tips? Thank you very much!