I've been driving the 56 daily cause its all I got running right now. Without any door panels, it had a few air leaks coming in on me from the doors! I had bought seats from a 2000 Chrysler Concord to put in my 55 last winter. I had also bought 5 yards of matching material from Detroit, 1/4 in. foam, and a few yards of black vinyl to make my door panels. All this interior stuff has been stored in my spare bedroom. I have my original seats for the 56 getting reupholstered but it has not been started on yet. I decided to go ahead and use the Chrysler seats for now until the original 56 seats are finished. I will install the Chrysler stuff in my 55 when I get it painted this spring. I had some scrap pieces of masonite, so I used it for door panel boards. I'm trying to NOT spend money right now so I'm using what I got laying around. Here is one of my rear door panels. I used black carpet on the bottom because they are seperate pieces and I like the look. I'm NOT an upholsterer but I try!