Grammar pencils

Love it and and use it, so people understand what you mean. https://www.grammarly.com/blog/what-is-the-oxford-comma-and-why-do-people-care-so-much-about-it/

No thanks. If you use the Oxford comma, it means you must follow the other Oxford rules such as '-ize' instead of '-ise'

I'm American, so yes, that's how I spell things. So what? The point is that the Oxford comma is used for clarification. If you say "I hate those clowns, Trump and Clinton," it means something different than saying "I hate those clowns, Trump, and Clinton."
The first implies that Trump and Clinton are the clowns (while true, this isn't the point), while the second includes clowns as a third group that is separate.
The comma gives the sentence a completely different meaning, and that's why it's important.

You don't need to explain, I am quite aware of what it means. And I'm British, the '-ize' thing isn't just American, as the Oxford dictionary has used it for a long time.

Exactly. The other books know what's up.

Any luck finding these?

No.