The file 'Stepcraft Laser Mount Adaptor 3D Printer Model' is (stl) file type, size is 66.1KB.
Heres a 43mm od laser mounting plate to suite the below laser from banggood. it includes air passthroughs for cooling.
https://www.banggood.com/445nm-2_5W-2500mW-Blue-Laser-Module-With-Heatsink-For-DIY-Laser-Cutter-Engraver-p-993521.html?p=9X051049165582016063&cur_warehouse=USA