WindTunnel Upright Self Propelled With Bag These Parts Fit the following Model Numbers unless otherwise noted: U6423-900, U6425-900 (Ultra), U6425-920, U6429-900, U6430-900, U6432-900, U6433-900, U6431-900, U6445-900, U6445-920, U6445-960, U6449-900, U6450-900, U6435-900, U6437-900, U6439-900, U6441-900, U6441-940, U6451-900, U6451-960, U6454-900 U6455-900, U6455-960, U6458-900, U6460-900, U6470-900, U6470-910, U6471-900, U6485-900, UH50000, UH50005B