Redcat Racing Part # MPO-02 Aluminum upgrade hub carriers. Compatible with the following Redcat Racing vehicles: CALDERA 10E, CALDERA 3.0, CALDERA SC 10E, CALDERA XB 10E, EARTHQUAKE 3.5, EARTHQUAKE 8E. Redcat Racing is located in the United States and has a full staff of support personnel to help you with your Redcat Racing product. Consult your vehicle manual for correct fitment and assembly. Since 2005 Redcat has been your source for fast - affordable - fun!