[cletrac (RIP)]

Here's a pic of the seat bottom assembly, albeit in less than pristine condition. Seeing as how I've got around 25 seats and only three bottoms, my guess is that they're not that common.
The two edge rows have 6 springs each and the four remaining rows have 7 springs each. The springs are 2" diameter and 4" long and they're made of 1/16" material and there's five coils. The outside ring of springs are held together by hog rings as are the fore and aft rows.
They had a layer of horse hair type stuff over them then the canvas.
Now we need to find a supplier at a reasonable cost.
The tension type springs on the seat backs wear thin and break where they make ontact6 with the rings. It's an easy procedure to take a pair of needle nose pliers and bend out a fresh coil to wear on and remove the remains of the broken coil. Even with this method you'll still need to access more springs since there's always a few missing.
From everything I've been able to find on the subject, the seat cover canvases were only offered in one colour and that was khaki. The side curtains were made in desert stone, brown, khaki, etc, but the parts lists don't mention colour in relation to the seat covers. The same applies to the rear seats on all body styles. They was only one part number for them and that was a brown leatherette material like on my original 2A1 rear seat.