Installed the rear shocks today. Bilstein B6 HD. As I said, my rear shocks were 'gone'. One of them was leaking. Upon removal, it was clear it was totally shot. It would not even return upon compression; the other one was still functional. The shock mount was litterally destroyed (deformed) as well because the shock was not doing its job anymore and it was taking the brunt of it. Next week, I will do the front shock. Drives like a different car already. Job done in 2.5 hours. Pretty easy with the right tools and some BMW experience under my belt.
Old damaged OEM shock after 90k mi. (not by me, bought it like that):
New shocks installed:
Fresh shock mount:
All hardware, the whole tower, was refreshed because everything was worn and rusted.