I think that Saturn bought a few of the group buy sets, as I remember, so they would have had limited stock and have probably sold them all.
I think DStanley1809 took over the suspension group buy from Bonzo (see:
http://www.haynes.co.uk/forums/showthread.php?t=4423) [EDIT: Just realised Steve (SeriesLandy) you've the link in your post, sorry to double up]
I'm preparing my suspension brackets for mounting on my chassis at present and have got my bolt set, bushes and crush tubes out on the bench. What are great pile of stuff! The suspension bolt group buy saved so much hassle on specifying and sourcing all the bolts one's self.
I know that's no consolation to the OP, however, I'd suggest a PM to either Bonzo or DStanley1809 might get you the details you require to order them yourself.
Perhaps you could do a group buy? It would be much appreciated buy other forum members.