I`m not sure about this but I think the Motolana swingarm is shorter. The Radian swingarm (direct bolt on??) is a little longer and uses a 17mm axle compared to the 20mm stock XS so a bearing change and new spacers have to be done. You would need to move the shock mounts in and forward to get the right shock angle. A neat braced Chrome-Moly swingarm would be much lighter and stronger.