Hey Rus,
If I remember right, the air filter is 9" diameter, and what appears to be the "padding" is actually rounded wood pieces attached to the hoop that allow a "sleeve sewed into the top to pivot with the folding operation. The "pivot brackets" are different too, for the ability to fold the top back. Charles Tate did a lot of research quite a while back for his convertible restoration project. I have lost contact with him in the last few years since covid.
Patterson also had some other rare options. It had a floor button windshield washer system (pic 1) and a storage bag for the water (pic 2). Also, a remote mounted "vacuum-boost" to power-assist the brakes (pic 3). I put one on my Dj, (from Australia) but my project has never made it to drive-status. Patterson also had a unique for my eyes, of a neatly tucked away to the back wall "rear seat" when not in use (pic 4). I hope all of those things are still there.