according to
according to Clymer Sea Doo Water Vehicles Shop Manual 1988-1996 (W809-3):
SP first produced in 1990 model number 5803 (Should appear on sticker on back of ski - typical)
1991 SP model number 5804
1992 SP model munber 5805
1993 SP model number 5806
1993 SPX model number 5807 (begin production)
1993 SPi model number 5808 (begin production)
1994 SP " " 5870
1994 SPi " " 5872
1994 SPX " " 5871
1995 SP " " 5873
1995 SPX " " 5874
1995 SPi " " 5875
1996 SP " " 5876
1996 SPX " " 5877
1996 SPi " " 5878
Note the changes in SPX & SPi numbers over the years - strange - maybe wrong?
Hope this helps.