A new carriage with an improved cooling and light reflections protection will be released soon for 3dpBurner2.
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).