I discovered these parts in a box that came with my 1924 Coupe. I havenít been able to identify what these are and where they go.
They look like something that would go near the door. Part of the body assembly?
I'm almost positive they are the lower back outside filler pieces that fill in the cushion outside rear back corner.
If these weren't in there their would be a void in those areas.
The curved sides fit into the curve of each cushion. One is the right and the other is the left.
Those are almost impossible to find and when most people see them they don't know what they are far. Don't throw them away! No one makes these.
I have a 24 Coupe and remember seeing these when I restored it.
John has it right: those pieces do "cradle' the seat cushions.
These pictures (not my car) show where those pieces go