I thought 73 was the first year for the cardboard headliner. My first car was a 72 and it had the fabric headliner.
On my 73 swinger I wrapped the original cardboard in vinyl. I also did the sail panels with it.
Here is a pic of the sail panels. Note the extra flat to help cover where the package tray does not cover.
View attachment 1715365772
View attachment 1715365773
