Hey mate, sorry, turns out that my mate that was helping me strip down my wreck, had actually grabbed the cap, I said, "grab everything not nailed down" and he took me literally.
I found it today, so I also grabbed the entire expansion tank from the car, the cap does say made in Mexico, the smaller relief valve is spring loaded, and does snap up to seal the system. I will try to get a photo for you.
Cmohr
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