So, I just had a set of Bilsteins re-valved. My car came with the "normal" suspension. Before I install the Bilsteins, is there anything from the stock assembly I should replace or is it OK to reuse everything?
I do have new bump-stops. I am mostly concerned about the various rubber bits (28-013A, 28-775B, 28-012A, 28-776B, 28-0A3). See diagram below.

And yes, I want to keep stock springs so I can stay in ES. Not ready to be decimated in CSP or STR.

 

If they look good, I would reuse them. But check on the rubber isolators for the spring perches (28-0A3 and 28-012A). Mine were pretty torn up after only 30,000 miles.