What is this trunk panel called, and where can I find one, please?

My car is in pieces so I can get a photo for you.

That would be most welcome, thank you!

And if you'd rather keep it/them private, feel free to contact me directly so we can discuss this offline. In fact, I think I may prefer that, as I have some questions about this car that I don't think can be adequately adressed, or answered, here, given it's Aussie/Kiwi origins.

Mexicanas are very rare. Less than 200 built and some say only 70-ish.

Yeah, neither me nor the owner (formerly from NZ) are able to get an accurate count on the production numbers on these either, and while this one may be the only one here in the States, thankfully it's more of a "driver" than a "show queen", otherwise I think I'd be afraid to work on it.