I just put green HD bilsteins on my 88 911. Very happy, not too stiff. I also found it very confusing and hard to find the HD for both front and rear from the same place. Listings can be confusing.
Here is a screenshot of my invoice of what I got.
Bilstein part #'s off of the boxes
Front for boge: 34-001142, P36-0114
Rear 24-001694, B46-0169