Well, to be a bit of a smart aleck (when did you last use that phrase) it's hard to get a reproduction of something that never was
. Original over the springs was burlap, then a horsehair mat, then cotton batting. Pics of the original seat from my '51 are
here.If I were redoing my seat today, I'd go to the nearest Wal-Mart and buy a couple exercise mats along with some 1/2" hardware cloth/wire (hardware store item) to go over the springs. The hardware cloth will unitize the springs, preventing sagging and I suspect two exercise mats trimmed to fit would make a pretty nice seat.
When I redid my seat I wanted a firm no nonsense seat so instead of foam over the hardware cloth I used a medium pile Berber carpet. It's great for the first hour and putting around home, but on a long drive I wind up seating on a foam cushion.
Good Luck,
RonR
