roof insulation

[Jack4159]

Started putting the headliner on and then wondered if the roof would have originally had some insulation stuck to it before the headliner went on?
I can't remember any old insulation coming out when the car was stripped 2 years ago but looking at some pics there were some marks that could be the leftovers from glue/insulation of some type.
I'm happy to go without insulation if it was never there, but if it was there from factory would like to put some back in.
Any help appreciated as always.

[Royce Peterson]

There was insulation glued to the roof originally behind the headliner. Several vendors sell the reproduction version.

[Jack4159]

There was insulation glued to the roof originally behind the headliner. Several vendors sell the reproduction version.

Thank you Royce.

[98SVT - was 06GT]

If I remember the original was typical itchy fiberglass about 3/4" thick and yellowish in color. It's also there to help deaden the sound.