Glashütte Original

i have been looking at changing to a leather strap for my Glashutte sport evolution. Does anybody know what mm size is required? Considering Delaurian straps. They look amazing. Any comments would be appreciated. Looking for something intresting. Thanks P... 

I would look for something with curved ends like the Hirsch Mobile or Hirsch Principe Leonardo if you want leather. The reason I recommend the curved end strap for the Sport Evo is simple. The case is so thick, non curved end straps just don't look quite ...  

Has anybody done other leather straps with this watch? Would love to hear your recommendations