Koni dampers to serial springs

Hello together, with me the dampers are so slowly over (has run around the 124,000 km) and must be replaced. the originals are clearly too expensive (have automatic level control). I would like to have the dampers installed by koni (yellow). ask: is this possible with my standard springs? has someone already experience? I believe that my omi is already 20 mm lower as standard. please info thank you in advance … gruß gimmig