custom442 said:no, the material is a foam glued onto a thin layer of the material. It will no doubt look terrible if you re-use the old stuff. Gluing on a headliner is somewhat of an art, but the good thing is G body's have a fairly flat roof without obstructions which makes it easier. Buy some good quality contact cement and practice first on your old one with some scrap material.
but, if you've never done it before, take the material and headliner to an interior shop and they should charge about 50-100$ to glue it on.
Thanks for the advice. It also looks like you can actually buy the headliners already covered, so I may go that route - remove the old one and pop the new one in.