This carriage can be used with different laser heatsinks but the recommended one for new builds is the pictured one.
Take care, there are other very similar but with a little different shape.
The new heatsink is 22x27mm and the center hole is just 12mm for better heat transfer (previous was 12.5-13mm). The length is variable for some sellers it goes from about 30-60mm length. The recommended one is the 58-60mm (max admissible by the new duct is 60mm).