Traxxas sway bar kit, xo-1 (front and rear) (includes front and rear sway bars and adjustable linkages) 38-6499 description: fine-tune the high-performance handling of your xo-1 supercar with this adjustable sway bar set. Sway bars reduce chassis roll and increase corner speed on high-traction surfaces. The bar thicknesses are precisely tuned, and install in minutes without disassembly. All hardware and instructions are included. Accessory part for these models: xo-1