I talked to the local upholstery guy that I plan to have fix my unisons and he said that your upholstery guy is too young. He said he has saved springs from old seats or will make new springs from a roll of spring steel he has. He advised to find an old timer that didn't mind that kind of repair work. He told me that my seats were not cherries but that he could make them live again. I had to go ask after seeing your post.