Headliner Installation '72 Duster

Hey just wondering, i have a 72 Demon with cardboard and i am putting a 6 bow fabric liner in the car, should the bows just clip in place...or will i have to modified to make it fit

There are little metal clips that are V shaped that the metal bows fit into. They are available if your car doesn't have them. My 67 had a cardboard headliner, but had the clips already installed??

I am farming out the cloth headliner on both of my cars. My local interior guy charges $150 labor and no, the glass does not have to be out to install either type of headliner.