Canadian made vehicles do not have the tow eye. Japanese made vehicles do since that is what is used for a tied down point when they are shipped to the US. I have a Canadian made R4 so I can't help with actual measurements.
The 49th post in this thread shows the part number for the towing eye. That might answer your question.
I'm not sure how much variation exists between the various trim lines- I have a 2021 Hybrid XLE. I spent all day working on this project yesterday- its not a quick process. The front trim comes off surprisingly easy, just lots of fasteners to remove. A flexible drill extension was very handy...
It is honestly a made-up thread pitch. The major diameter is 18mm, but the pitch is something like 3.5mm and the actual threads are very rounded like what you would see on a molded plastic child's toy.
I searched and searched, but never found anything that matched. I ended up buying a 3/4-10 tap and just tapping the holes out to mount my own custom hooks.
To be clear, tapping an 18mm hole to 3/4" (19.05mm) is only something like 40-45% thread engagement, down from the 65-70% that is common in matched threads. However, the actual reduction in strength from such "loose" thread engagement is still on the order of magnitude of maybe 50%. Thus, assuming simple mild steel threads, each hook can still technically hold tens of thousands of pounds of straight pulling force.