Originally Posted by Zebe
My factory rears had a lower rubber seat that fit between the bottom of the spring and the top of the strut perch. It does not seem to appear in the pic. Did you reuse these on the D-Specs? I didn't, but that's mainly because I didn't notice the lower rubber seat until after I had both sides assembled and one side reinstalled. The spring seemed to sit just fine without the lower rubber seat, so I am thinking it won't be a problem. So far, I have not noticed any ill effects.
I think the rubber seats are there to reduce clunk noises if you ever fully extend your rear (which is easier to do than the front).
You're in no danger without them, but if someone ever is in the process of assembling struts/springs, they probably should put it on there.