[Darren69]

The 900sie is a bit of a weird one that came in 2 flavours (early hoop type that are more common as made for a couple of years or the later stop gap model which was only for one year. Most of the later ie tanks should be the same as the S4 one eg 1000/800/620ie and probably won't fit the 900Sie 100% I think mainly because the seat/tank part changed . So the seat won't line up properly although the actual tank may fit (kind of).