Based on this product's specifications, here are some alternatives and similar models
PCIe riser card FUJITSU PY-PRE853 FH Slots x8 Right for server/motherboard expansion
Summary description:
FUJITSU PY-PRE853 is a PCIe riser card designed to provide FH (full-height) x8 expansion on compatible Fujitsu systems. It mounts to the motherboard or chassis to relocate a PCIe x8 slot to the right, enabling installation of additional PCIe cards in constrained server or workstation layouts. Suitable for system upgrades, component replacement, and optimizing internal space.