Just to add to this. I did my KwV3 install this past weekend and replaced the bushing on top of the spring. It’s part #16 on this diagram
http://genuineaudiparts.com/media/images/oe/collision/1/1399425.gif
But when I was throwing everything back together I noticed another rubber bushing that needed to be replaced, it goes on part # 13 on that diagram and isnt shown. My old springs had worn through it an my theory is that the spring would occassionally knock against that metal peice shown and cause an inconsistent knock. So I replaced both parts and so far have had no noise from the suspension. I’m at 66.5k miles, 40k or so on the old kw springs.
Has anyone gotten a creaking from their seat over bumps?