>>It's not quite that easy, If you want to use your rim you have to have it drilled and tapped to install the second rotor.<<
Like I said, you have to wonder what the hell Suzuki was thinking when they imported the B4 with only one disc into the US.
Still, it's not too difficult to have that done at a local machine shop if you don't have the resources. Of course, if you can get it with a rim that matches your existing setup, or if you can get both rims to match, it's not an issue.