Headliner assistance

the fabric head liners are not glued in, they have galvanized rods that slide thru cloth like tunnels, and fit in holes on each side then have clips that hold the sides go up under the inside trim, with springs on back at rear window, and mirror and sunvisors help hold up front,then you trim and tuck the excess under the rubber gaskets front and back, they didnt come out with the cardboard head liners until 73 or 74,so yours being a 70 model the holes are already on each side already, i have a 74 duster , got a nem cloth headliner for $65 and pulled the galvenized supports out of a 72 demon for$20, some are 4 rod and some use 6 rods , if you have headliner out look down each side and see if yours was 4 or 6 on original headliner...hope it helps, new cardboard headliner are between 2 and 3 hundred dollars and i dont like the way they look