50mm fan mount for J-Head Mk V

My old 30mm fan was very noisy. Figured out I could easily design a part that could fit 40mm fan instead. So here's the final part, that's designed for a 50mm fan :-)

Designed for JHead mounted on Geeetech metal extruder holder:
https://www.geeetech.com/mk8-extruder-holder-p-949.html
https://www.aliexpress.com/item/Metal-MK8-Extruder-Holder-For-Reprap-Prusa-I3-3D-Printer/32457689132.html

The bit that goes around the JHead is based on some model, which I can't find now... Otherwise, creat