Not sure if it helps but I’ve got a ‘74 duster that I can cut patch panels from if you need. None of the parts I have are mint but a lot of it’s solid.
I got that piece cut out for you, unfortunately I bent it a little and it has a small crack as you can see in the pic, let me know if you still want it, thanks!
I got it cut out and ready, send me a message with your address and I’ll give you price and let me know if you want the whole thing or just the 30 inches