model change? 
  just while i remember (i could have put this in another post)...i notice that a lot of articles or items for sale relating to a 900ss might say "...fits 91 - 97..." for instance.
 
 was there a very brief update then for 1998?  my bike was first registered in feb 1998, so therefore a 1997my, is that right?  i presume the new shape 900ss came out later in 1998 and thats the reason things are specified up to 1997...but that is just guess work on my part! ;-)