Tips to install cardboard headliner?

'74 Sport said
The sides have two or three small metal clips that hold the edges of the headliner to the roof rail pinch weld.
Good luck,
Jerry

Does anyone have a pic of what these clips look like? And, where to get them?

Both windshields and the quarter windows are out, as is the entire interior. We recently finished painting the car and now are getting ready to put it all back together.

Thanks for the help.
Ken