Mazda Sport Package's (JDM RS-II Package) Rear Swaybar. The non-sport package rear swaybar is a 11mm bar. This swaybar is 1mm thicker, which is 12mm. Comes with two rubber bushings, since the old ones wouldn't fit. Nothing really special about the bar, looks exactly the same as the 11mm bar, only thicker. Same black powercoat and everything. I brought it to complete the sport package that's all. No point on buying it if you're not using the sport package yellow bilsteins. You could get a much thicker bar for the money if you're using aftermarket shocks. I wanted the sport package setup, so this is the most balanced bar for me.