Rear sway on the GSR is larger than the other models, but is still much smaller than the ITR sway (the ITR bar is not a direct bolt on to other models). Neither the R or the GSR come with the rear STB from the factory in the US. The front strut tower bar is black welded steel on the GSR, while it is a 3 piece unit with a polished aluminum bar on the ITR. Rear lower tie bar does not come on any model except for the ITR - the subframe has an extra spot on either side for it to bolt on. If the lower tie bar is attached to the LCAs, it is not a factory item (unless it is the Comptech one that you have to drill holes in the subframe for).