Replacement rear shock question

[SteveL]

Hi all, i'm Steve from Bedfordshire and I recently became the proud owner of  a 2001 Fzs1000 which I bought from a friend for £200. Needless to say it was in a bit of a state.After a fair bit of elbow grease and a new rear wheel, silencer and tyres the old girl is now back on the road. The bike rides great but is still on the standard rear shock which definitely needs replacing. Having read a fair bit on the forum I've decided to put either an R6 or S1000rr unit on the bike. I was wondering if any of the later shocks from either model will fit as there seems to be more choice on Ebay ? Cheers, Steve.