The file 'Rear Vent To 2.5″ Adapter For Anycubic Photon 3D Printer Model' is (stl) file type, size is 449.5KB.
This is a 2.5" version of my 4" adapter, using measurements from Mauro Segura's design.
I have not yet printed this variant myself, so please let me know if you run into any difficulties with it.