There are kits available from the regular vendors for the original style cardboard, but only have the first 2 pieces. I got a headliner from Classic Parts. The first piece was short on the edges and left a gap over the door opening. Here is a picture without the trim in place, it looks less bad with the trim, but it is still bad. My truck is a ’47 so may be different from later years. The headliner in the cargo area looks like canvas that is painted grey. It was installed as one piece between the ribs and the roof, so I don’t know how it could be replaced without removing the roof, or the ribs. The original cargo area walls had cardboard that was grey and had a rhino texture. I used Grey Tolex glued to Cowl Board.