attaching interior wool covered panels with?

[ilangford]

about to replace all interior panels on Model A Deluxe Coupe 1930. I cannot figure out what covers the exposed clip; the clips that are used to attach the door panel to the frame of the car. And I cannot find a good picture of the 'finished 'look' of the interior.
I am going for the authentic, original wool covered panels... (currently, the interior panels are held in place with exposed screw and ring washers. No idea if is how the original panels were held in place....

Help!

Thanks!