Print the object. Use screws to secure to the X carriage.You will have to rotate the motors so that the wires exit the side of the motor (to the outside on both sides) instead of the top as shipped.  This is straightforward, just remove the fans screws, release the pressure on the spring, remove the tension pivot, then remove the remaining screw.  Rotate the motor and reassemble. Repeat for 2nd motor.Now put the extruder into the mount.  Use threaded rod cut to appropriate length to secure both mount caps onto the motors, and clamp down tight.