Sway bar kit, Revo (front and rear) (includes thick and thin sway bars and adjustable linkage) (requires part #5411 to install rear bumper). The Traxxas Revo sway bar kit is a must have for Revo racers everywhere. The kit was created, developed, and extensively field tested by Traxxas driver and reigning monster truck national champion Tim Roberts. The sway bar kit fits Revo, Revo 3.3 and E-Revo and it includes front and rear linkages, mounts, thick and thin sway bars, hardware, a tuning guide, and comprehensive installation instructions.*Can not be used with stock rear bumper mount setup. Must be used with rear wing mount #5411.