Traxxas 5254 Header Spring with Gaskets, TRX 2.5, 2.5R, 3.3 Use Traxxas stock and hop-up replacement parts to get the most out of you Traxxas RTR vehicles This product is made from high quality materials and designed for lasting performance This is for use on RC engines such as the Traxxas TRX 3.3; consult your user's manual for exact parts listings