Trunk Divider Cardboard and Insulation

I have a 72 Challenger that is missing the trunk divider cardboard.
I bought the cardboard and the insulation but I am not sure of the proper installation since the car didn't have it when I bought it.
Does anyone have a pic or can you describe the proper installation?
How is it fastened in place and I assume the insulation goes on the cabin side of the cardboard.
Thanks in advance.

I have yet to see one with an insulation ..the panel just lays flat and hooks onto the 2 top seat hooks

Yep, no insulation on the originals.

I am not sure if Challengers had insulation form the factory or not, but it couldn't hurt to add it. If it helps, I have a '74 Charger SE that had the jute-insulated side facing out to the trunk, from the factory. The insulation was visible when you opened the trunk. When I restored the car, I replaced the old board and faced the insulation side towards the rear seat back. That way, the trunk looked cleaner and the jute padding was less likely to get damaged or collect dirt. Not sure which way would be correct, but I would face the cardboard side towards the trunk.

The divider just hangs on the back seat hooks with the insulation pointing toward the back seat.