Check with Robotdigg, they have threaded rod steppers with TR8x8mm screws (I belive that is the same kind used on the new Z-axis and the UM2) up to 500mm in stock, and says that they can do custom ones: http://www.robotdigg.com/category/8/Threaded-Rod-Stepper
The new lead screw is attached to the motor. As in, they're a unit, not separate pieces.
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