This is the CRC LCG slider pods Rear Carbon Fiber X-Brace with Fan Mount. This optional 2mm carbon fiber brace with a fan mount that can fit most popular cooling fans featuring a standard 24mm square bolt pattern and is compatible with all CRC cars equipped with an LCG (Lower Center of Gravity) slider pods to provide a stiffer lightweight solution and a must have upgrade for serious racers. Package includes one rear carbon fiber X-Brace with a fan mount.