TKR9184 ? Suspension Arms (rear, EB/NB48 2.0)These optional suspension arms are made from a stiff composite material and are intended to be used in hot weather conditions or any time a more direct feeling is desired to sharpen up the handling. We recommend using these arms when the ambient temperature is above 95 degrees Fahrenheit or 35 degrees Celcius. Please keep in mind that they are not as durable if used in temps below 40 degrees Fahrenheit or 4 degrees Celcius. No additional parts are required when replacing?stock TKR9184XT arms but they are 1mm longer and will require camber to be readjusted.These optional stiff rear arms are to be used with the front stiff arms part # TKR9286.