CRL3100, guess I'm slow on the trigger, Jockbolter beat me to the punch. His find is the tread I referenced above, a tease paragraph paragraph follows;
"Well after playing around with the seat frame and springs, I officially gave up on reusing this seat. I will build my own bench seat from scratch. I will use a plywood base and high density 2445 foam. From the outside, the seat will look like a factory stock bench seat. I will use the original wire frame and copy the size and shape using solid foam."
The seat details are on page 6 and 8.
http://www.jalopyjournal.com/forum/threads/my-53-chevy-truck-project.629357/page-6It's an awesome build that certainly makes me feel unworthy!
Good Luck, Ron