Replaced springs and horsehair pad on my W123. Makes a big difference.

Took a lazy 4 hours to do which included removing the passenger seat at same time and swapping its seat cover to the drivers side cause it was in better condition. Is a little difficult getting the springs on and off; have to keep adjusting the height of the seat while out of the car to get the screws exposed and/or lined up so you can undo and then reinstall. Not hard; just time.

As I remember was $200 for the springs and $100 for the pad.

Usually one or two springs are broken and then the pad impales itself down onto the springs. Folks stuff foam, towels and ol clothes up in there for support.

If keeping the car, a couple hundred dollars for a non lumpy seat is money well spent.

Your seats are probably electric? Might be easier to replace the pad only.

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Terry Allison
N. Calif. & Boca Chica, Panama

09' E320 Bluetec 77k (USA)
09' Hyundai Santa Fe Diesel 48k (S.A.)