The Traxxas 8364 red shock Springs (+1 Rate, green stripe) fit the Traxxas 4-tec 2.0 chassis (front or rear) use Traxxas stock and hop-up replacement parts to get the most out of your Traxxas RTR vehicles. This product is made from high quality materials and designed for long-lasting performance. This is replacement hardware for use on Traxxas vehicles; consult your user's manual for exact parts listings.