Based on this product's specifications, here are some alternatives and similar models
Power Supply Unit Lenovo 500W ATX model 5P51D77197
Summary description:
Lenovo 500W ATX power supply unit, model 5P51D77197, provides up to 500 watts of DC power for compatible desktop systems. Designed to fit ATX enclosures, it supplies essential rails for processor, motherboard and peripheral components. Suitable for system upgrades, replacements and repairs where a reliable OEM-form factor PSU is required.