Suspension R & R
I rebuilt the rear suspension of my '86 300E last December. Used Bilstein Comforts. Redid the front yesterday, used the same again. My springs are still good even after 188,000 miles.
So my recommendation after searching this forum is to use/match the Bilsteins with your springs. I beleive the stock combination was the comfort not the HD.
Good luck with your ride...