Just shot UPR an email to ask about gasket replacements because I don’t see them on their site.
If someone has a source for the green gaskets, please provide a link.
Not sure how people are breaking the stock plug. I just did my first oil change and it didn't require much pressure to loosen, and I just re-installed by hand until it clicked into place. Like mentioned above, they're cheap so just buy a replacement if you're worried about breaking them.