So you used the 900 CC monster? Does it use the same forks?
I don't think so.
I believe the 900 used Showa forks and the S2R800 uses Marzocchi but AFAIK they are the same diameter. I never saw both springs side by side as the dealer did the install but I got the old springs back in the box that the new springs came in. The part number I posted came straight off the box. I've put 6000kms on the bike since and nothing has blown up yet.
I got the impression from my dealer that he has made this mod for many of his customers.
Maybe a real guru can chime in here and confirm?