Based on this product's specifications, here are some alternatives and similar models
Riser PCIe x8 - PCIe x16 DeLOCK 89166
Summary description:
The DeLOCK Riser PCIe x8 to PCIe x16 adapter allows for flexible installation of PCIe cards in your PC. It features a PCIe host interface and a PCIe output interface, ensuring high-speed data transfer. This adapter is ideal for enhancing your PC's connectivity options and is designed for wired technology, making it a reliable choice for various applications.