My wife has a 2009 XB12Scg and I ordered the whole "comfort kit" for her from American Sportbike for Christmas. We tried to install it the other day and I can confidently report that the underseat piece definately does NOT fit on an S model. We tore the entire tail section off to make sure, and there's no way in hell that it would fit, even if you trimmed it. So we wasted a little money, don't make the same mistake. Just get the scoop and/or the exhaust heat shield separately if you want either one.