I own a W123 300D NA Auto and find my W115 240d 4 spd manual is far sportier to drive. Guessing the HD struts will only amplify this.

I'm puzzled that the shock/strut manufacturers don't supply a graph or numerical rating for the expected performance of that part. It seems this would provide a way to pick a damper that would better match the desired handling and ride.

I talked with a US Bilstein rep about a month ago and he said the individual spec's are proprietary. I guess I'll try to select a ' mama bear ' version for my 95 E300D so it'll be in between soft and harsh.

Aftermarket Coil Spring Source
 

I found this place, they sell W126, W123, W124 etc.....

https://www.**********/1984-mercedes-e-class-coil-springs/

Received the HD struts. Was pleasantly surprised to find them made in Germany. They come with the bumpstop, sleeve and all the hardware as well.