Can't believe I missed this thread before. Great looking XS, nice transformation from special to roadster. For a cafe seat, I bought mine from Dave at Fastwing. Very nice quality and I love the pad/cover that came with it. He has several styles to choose from as well as other bits for the 650. If you just want to add a bump, I like the look you get when cutting the rear of a matching tank- then the lines of the bump match the tank.
http://www.hotwingglass.com/
Matt