Based on this product's specifications, here are some alternatives and similar models
Riser PCIe x8 DeLOCK 89104
Summary description:
The DeLOCK Riser PCIe x8 adapter is designed for internal use in PCs. It features a PCIe host interface and a PCIe output interface, ensuring high-speed data transfer. With a compact 1U form factor, it is ideal for space-constrained environments. This adapter enhances connectivity options for your PC, allowing for the addition of multiple PCIe devices. Perfect for upgrading your system's performance.