I believe Rod Doors may have at one time made a formed panel for behind the seats, but they’ve been out of business for at least a couple of years. I’m not aware of anyone else ever producing a custom panel for this area. I just picked up some ABS from the local plastic supplier and upholstered it in 3 sections. I used ¼” because of the size, and the seam are hidden by the seats.
Here are the 3 pieces of foam that went over the ABS, showing the overall shape:
The finished center panel:
And everything installed:
