No. The Magic Pulley is only included on the XX SL and XX models of Eagle Transmission. GX and X0 Eagle Transmission derailleurs can be upgraded to use the Magic Wheel pulley by purchasing the pulley wheel kit for XX SL (part number 11.7518.104.006) or XX (part number 11.7518.104.007). You can also upgrade to the XX (part number 11.7518.104.011) or XX SL (carbon) cage assembly (part number 11.7518.104.010). You can see information on the torque specifications for the pulley wheels and the replacement procedure for the entire cage assembly below, please reach out to SRAM Rider Support with any other questions!