I am no expert on headliners but I know that there are two types anyway. On my 49 I have a metal bar which goes across from door to door. There is a channel on the front and rear of this bar. On other, I think later trucks, there is a floating bar which holds the two pieces of the headliner up in the center. I feel strongly that your cab would have the floating bar.
FYI putting in that cardboard headliner can be very frustrating. i have had my cardboard headliner for years and its still not in the truck.
Hope this helps but again someone can correct me on this.


1949 Chevy 1/2-Ton
"Sedgewick"
In the Gallery
1989 Caprice