Bench Seat question

Redfish is right on, I noticed that when I redid my seats myself.
The original foam was also formed, it rolled over the edges, not a giant square block that sat on top.
The back of my rear seat also had a layer of cotton at the bottom between the burlap and springs, like a lumbar support.
The front bottom also had a strip of burlap running on the underside of the front edge of the springs, to tie them together and to tie to the ends.
Also, the original inserts that the hog rings clip over are steel, not rolled cardboard.