Based on this product's specifications, here are some alternatives and similar models
Radiator Alphacool 14391 — Steel, Black, 378 × 360 × 65 mm, 2.27 kg
Summary description:
Alphacool 14391 radiator made of steel in black finish. Dimensions: 378 × 360 × 65 mm, weight 2.27 kg. Designed as a component for computer liquid cooling loops; sold as a single unit. No integrated fans or CPU-socket support — suitable for custom water-cooling setups where a compact, steel radiator is required to dissipate heat from looped coolant.