If you mean these (pointed by orange arrrows), they're flat metal rings.
The tender springs were purchased separately later & added. The installer shop ordered it thru either GC or Eibach.
Re: rear bump stops, not sure. All parts of the kits are in those photos. Perhaps the 2 installed photos, shown below, might help.
And, here's a DIY with lots of photos --> http://www.m3post.com/forums/showthread.php?t=552785