‘72 Demon cardboard headliner install

I installed mine in my 73 Sport also with the front and rear glass in and the seats out. Lined up the center with the dome light and let that support it while I messed with the front and back. One tip - you'll probably have to trim both ends a bit to get them to fit under the glass gaskets without the gaskets getting out of shape and not fitting flat. Don't worry about trimming it, just do it a bit a time and don't get in a hurry. I had mine in and out several times doing the fitting. And it's a real pain without a helper.