Based on this product's specifications, here are some alternatives and similar models
Heatsink Barrow DDC DCHL-V3 white — Barrow DCHL-V3 white heatsink for DDC pump
Summary description:
Barrow DCHL-V3 white heatsink is an accessory designed for DDC-series water-cooling pumps. Finished in white, it mounts onto compatible DDC pump housings to improve heat dissipation and stabilize pump operation. Suitable for custom PC liquid-cooling loops and industrial cooling setups where a compact pump heatsink is required. Easy to install and integrates with standard fittings.