Think its a VM 28-49 it came with a booklet thats not a lot of use..Yes that's a good idea will look into that the Bing looks a quality carb,the Mikuni seems the wrong hand as well the air mixture screw is on the right side so the exhaust blocks access when on the bike you can get them on the left so another reason I think they sold my mate the wrong carb he did specify the bike when buying that carb.Shame if it is as its brand new and could be of no use,might be worth getting in touch with them to ask..
Cheers Adam.