At 100K, just replaced the front shocks and rear springs/shocks on my 99 ML320 with Bilstein and the ML55 springs/shocks, respectively. Interestingly, the ML55 springs are the same length as but different color from the ML320 but the shocks are about 0.5" shorter. Since the front Bilsteins are also slightly shorter than the OEMs, I am not sure if I'll need to adjust the front torsion bars. I am going to drive for a week to let everything settle in before making torsion bars adjustments, if necessary.

The truck appears to sit higher than before but I am not sure if it is because the old units were shot and were sagging or the new units haven't settled in yet. Overall, the new ride is so much smoother. It is difficult to detect the gradual deterioration of the ride daily but with the new units in, it feels like night and day.

If anyone needs the OEM rear springs, please contact me.