I found th elink to the thread for the quick install. It applied to a w124, but it should not be too different from the w210 spring install.
H&R Spring Install Procedure (Quick and Cheap!)
'92 300CE - Sold
2004 C240 - C7 Wheels
2015 ML350 - P1, Pano, Ash poplar wood, Sport Dinamica interior, Running Boards Keyless go.