Based on this product's specifications, here are some alternatives and similar models
Internal power cable Akyga AK-CA-55, 0.15 m, PCI-E 6-pin to 2× PCI-E 6+2-pin
Summary description:
Akyga AK-CA-55 is a short internal power cable (0.15 m) designed to split a single PCI‑E 6‑pin connector into two PCI‑E 6+2‑pin connectors for powering graphics cards or other PCI‑E devices. The compact cable weighs 0.0137 kg and is intended for use inside PC cases where space is limited, enabling connection of two devices from one PSU PCI‑E output.