General description The Power Steering Pump is designed for 1990 - 1997 Lexus LS400 All Models. It is an essential component for ensuring smooth steering and handling of your vehicle. Technical specifications OEM Number: 4432050010 Interchangeable Part Numbers: 44320-50010, 4432050020, 44320-50020 Installation Professional installation is highly recommended. Instructions are included for guidance. An E-book version of the installation guide is available upon request.