Did you try, oh, I don't know, Toyota?

Well, the cooler itself 32910-35010 is a discontinued part. You might be able to get it FROM Japan. https://www.megazip.net/zapchasti-dl...oil-3291035010 (I'd say "call first," but I don't speak a word of Japanese).

Your picture, though, doesn't look like a leak in the cooler. It looks like it's leaking from the crush washers. You didn't back that bolt out and try to put it back without new washers, did you? I've only been able to find them at the dealer, but they're cheaper than dirt. https://parts.lakelandtoyota.com/p/_...043014235.html If you need to order them, I'd order 4. You need two for that connection, and they have an unfortunate tendency to pop out of your hand and roll into the grass.

 

This kit covers any metric crush washer you would ever need:

https://smile.amazon.com/gp/product/...?ie=UTF8&psc=1

 

Megazip has really good customer service, they respond in under 24 hours to inquiries in my experience, if they can't get the parts they will let you know and update the website promptly.

And passable English, which is a big plus!

Looks like a leak at the crush washer here also. Tightening a seated crush washer can alter it's seal also.