Based on this product's specifications, here are some alternatives and similar models
Power Adapter IBM 90W 20V 4.5A
Summary description:
The IBM 90W power adapter provides a reliable power supply for laptops with an input voltage of 100-240V. It features a compact design in black, ensuring portability and ease of use. With an output of 20V and 4.5A, it delivers efficient charging for your device. Model number: 42T4433-RFB.