Back in 70's I made a headliner for my 1939. I took the original out, moistened the corners and flattened it out and used it for a template. Cut the new one from flat stock, moistened the corners and reformed it to fit. It held up very well over the years. I bought a new one from one of the vendors a few years back. I still had to moisten the corners to get it to fit properly. Tedious and nerve wracking.
Rick
