Okay, sports fans. Here's what I've learned. I just found a junkyard 74 Duster with the Spacemaker Pak. The original carpeting was still in the trunk. First, as near as I can tell, regardless of the interior color of your car, the trunk carpeting was always black, as was the plastic trim panel at the rear of that trunk. In the trunk itself, there are two pre-cut black floor carpet pieces that cover the rear half of the wheelhouses. I recovered both of these from the junked Duster. They extend behind the plastic trim on the front half of the wheelhouses, and up into the void above the wheelhouses. They are glued to the wheelhouses. I found one 1975 Dart that had factory installed sound deadener attached to the back of these carpet pieces, but the Duster I saw didn't have this. I'll use these pieces as template for my new carpet. The floor of the trunk uses the same black carpet, extending from the hinge point at the bottom of the security panel, to the trim cover at the back of the trunk, and extending side to side from inner quarter panel to the opposite inner quarter panel. So the side trunk floor extensions are carpeted, and the carpet on the passenger side has cutouts for the jack mount. The carpet over the right wheelhouse has a hole cut into it to accommodate the upper jack mount. The inside surfaces of the quarter panels are covered with a black felt - like fabric, glued on, and extending from top to bottom, and from just ahead of the wheelhouse to the plastic trim panel in the back. That's all for now. Hope this helps!