Rustler,Slash ,Ultimate ,Hoss XO-1 4X4 VXL 3655R Heavy Duty Suspension A-Arms

These arms fit the rear position of 2WD models or front and rear positions of 4X4 models. But are not compatible with Slash 2WD models. 

Heavy-duty suspension arms for Slash 4X4, Stampede, and Rustler feature a design which incorporates latest proprietary composite material. Traxxas designed this composite specifically for high loads and hard landings with just the right amount of flex to resist breaking—even in cold weather. Whether you’re sending it at the skate park, or preparing for the next speed run, these arms were built for extreme punishment.