My W202 C230K Sport has bad sag at rear (probably the result of towing while with previous owner). I am going to be changing the shocks on the vehicle in the near future, but the amount of sag is so much that I think it is much better to replace the springs as well. Checking with the EPC it seems I need part number 2103243104, which supersedes 2023241004 that I assume is currently installed in the car. As can be guessed, stealer charges an arm and a leg for these, so I am looking at getting them manufactured for me. Lemforder cross reference shows the dimensions of the spring. Do you have any more advice in this field? I don't have much knowledge in springs/suspension. I am not trying to lower the vehicle, but want to restore stock height. I have done some basic research on coil springs and noticing that the behavior of the spring will also depend on the materials used. What would you suggest I choose?