I've started a new thread on this subject as the original comments are all mixed up with Jason's front suspension discussion.
OK, so the rubber shroud 'thingys' arrived today from the thesitebox.com
I ordered three sizes and you can see them on my Flickr site....
http://www.flickr.com/photos/peters-bmwmarlin/?saved=1
The S20 has an unstretched diameter of 27mm which I think will be just right to cover the wishbone bushes and nuts. Obviously haven't had a chance to actually try one yet!
The S25 shroud has a diameter of 36mm and the S32 has a diameter of 42mm. These are far to large and will go in my 'come in handy one day' bin.
Hope this helps...
Peter