After spring. Two level stiffness spring, a total of 9 pieces of sequence. The four main spring specifications are not 70*11, five pieces of Fu spring specifications for four pieces of 70*9, fifth 70*11, the main pay spring material are 60Si2Mn, spring loading of length 1250, ear diameter mounting Φ 25 hanging tip, ear diameter mounting Φ 16.15 hanging ba