Based on this product's specifications, here are some alternatives and similar models
Power cable for HDD/FDD PREMIUMCORD kn-3 — 5.25" to 2×3.5" internal drive power adapter
Summary description:
PREMIUMCORD kn-3 is an internal power cable that converts a single 5.25" drive power connector to two 3.5" drive connectors for HDDs or FDDs. Designed for use inside desktop PCs and server chassis, it enables powering two 3.5" devices from one 5.25" outlet. Useful for installations, upgrades and system builds where additional drive power connectors are required.