None of my adaptors worked for this saw to my shopvac (Rigid), so I made one. I printed this with ABS and it is a tight fit, but that is a good thing. So far it is strong and working well. You could also maybe use TPU, but it might slip off. Here is the saw that it works with.
https://amzn.to/3Yzdfgc
The author marked this model as their own original creation.