Exactly what I did on my '67 Sedan.When I built the sedan I used to have I had to make a template and cut one out of a coupe package tray which us slightly bigger.
and neither of those fit a sedan, thats the issuefor 66 there are two different styles the first design was used for the ear muff style headliners and the package try needs to be wider then the second design
okay I was told that the first design was just like a sedan. I guess it just looks closeand neither of those fit a sedan, thats the issue