Based on this product's specifications, here are some alternatives and similar models
Water block Watercool HEATKILLER IV BASIC — copper, PMMA, stainless steel; 59×66×17 mm
Summary description:
Watercool HEATKILLER IV BASIC is a computer water block constructed from copper, PMMA (transparent acrylic) and stainless steel. Dimensions are 59 mm (width) × 66 mm (depth) × 17 mm (height). Designed for liquid cooling of CPUs or compatible components, it provides a metal cold plate and transparent top for coolant flow monitoring. Made in Germany.