The 1929 station wagons I used to own had metal side curtain trays and yes they were under the rear seat and accessed from the rear of the wagon. As I no longer own a wagon I am out of touch with whether they are made today, but I doubt it. I did have an extra tray and when I advertised it the response was more than I anticipated. I see you are new to fordbarn and I suggest you place a wanted ad in the wanted section. You are now in a discussion forum.