This is a complete set of LIONEL #665/685/2055/2065 steamers with a side rod on both sides.  The set includes the rods and hardware for both sides and is suitable for a three-rail system with a wheel configuration of 4-6-4. These side rails are from a 2055 steam engine that is beng taken apart and sold for parts.  If you need other parts contact me and i will try to help.