If you are looking for high temperature motor steppers we highly recommend this pancake stepper motor. It's a class H high temperature stepper motor good to 180°C winding temperature. This is a high quality stepper motor is produced by LDO motors.
This stepper motor is perfect for direct drive extruders in heated chambers. For the Railcore II 3D printer with a BMG set the current to 900 mA. With this specific set up the stepper motor should be able to handle 135°C
Product number: LDO-42STH25-1404MAH