Are w126 seats suppose to be softer than w123? I have a 126 parts car and the seats are springy-er that my w123. No lean, just alot more bounce. My w123 are hard as a rock

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81 Mercedes 300SD 289k.......SOLD
82 Mercedes 300CD 252k......slow ride

82 mercedes 300 SD...mi Unknown
83 Mercedes 300D ????ksniff..gone too
84 Mercedes 300D 148k........SOLD
85 Mercedes 300TD 386k and holding some one elses project