Thank you! I've read everything, and I searched for the exact magnetron; unfortunately I have to go for an "80% compatibile model" since everytime I find a website listing the correct model it's either out of stock or the website fails under a 404 error.

I have one more question, since I noticed a difference between apparently the same model by different manufacturers:

Does the shape of the hole of the "microwaves cannon" make some difference? I can't find one with the exact shape of my original model (square): the available shapes of the alternatives are circle and triangle.. should I go for one of those randomly or there are better chances of compatibility if I choose one over the other?

Thank you again