Nice improvisation! I thought the reproductions were to come with the radius, it looks like yours come without? Not complaining, they look great!

Looks like a fair amount of work to make them look like originals. Do you have more information on the radius on the back of the seat? How long did it take to modify? Do you have more detailed pictures?

Do you have side by side pictures of the suburban top seat spring and the truck top seat spring? Do you have a picture of a truck bottom spring that I can compare to my bottom suburban spring?