P0420 Toyota Prius, Easy Fix!

O2 oxygen sensor mounting boss fitting plug fitting straight thread M18 x 1.5 is what I used.

They go in and out of stock on Amazon...You might just have to look around.
Here is a link to the search results for the part. Just make sure to get one that looks like the one in the video.
https://www.amazon.com/s?k=O2+oxygen+...