The problem is that Suzuki never brought the dual disc models over here.
So what you have is either a grey market bike, brought over from Europe that had the duals or you have a bike that had a front end swap done by the previous owner.
The first place I'd start is with the VIN and see if you can search/decode it to see the bikes destination as a clue.
Ultimately, you might have to pull apart one of the calipers, clean the brake pads and see if you can find a part number on them and google search to see what models they fit to see if you a franken bike or something that came in from overseas.
If the calipers are like mine, there is simply a "tokico" stamp in the side with no other identifications. You could also post a picture here too and someone might recognize them right off the bat....(and post what the piston diameters measure)