Carlisle Ultimax 3 has evolved into Ultimax PRO. Thicker cross section so more surface area is in contact with clutch. New cog design dissipates heat and aids flexibility Runs cooler for better performance. Run cool, run long & run fast with Ultimax PROAdditonal Fitment:1992-1992 SKI DOO BRP SKANDIC II R2000-2007 SKI DOO BRP SKANDIC WT1984-1987 SKI DOO BRP SAFARI 3772004-2004 SKI DOO BRP SKANDIC SPORT 5501987-1988 SKI DOO BRP ESCAPADE1990-1993 SKI DOO BRP SAFARI L1991-1993 SKI DOO BRP FORMULA MACH I XTC1994-1994 SKI DOO BRP SKANDIC II2004-2006 SKI DOO BRP SKANDIC SUV 6001985-1985 SKI DOO BRP FORMULA SS1987-1990 SKI DOO BRP FORMULA MX LT1993-1993 SKI DOO BRP FORMULA PLUS II1989-1989 SKI DOO BRP SAFARI SAGA1987-1987 SKI DOO BRP SKANDIC 5032004-2004 SKI DOO BRP SKANDIC SUV 5501994-1994 SKI DOO BRP SAFARI RALLY E1994-1994 SKI DOO BRP SKANDIC II 503R1990-1992 SKI DOO BRP SAFARI GLX1993-1994 SKI DOO BRP SKANDIC II 377R1998-2007 SKI DOO BRP SKANDIC SWT1994-1994 SKI DOO BRP GRAND TOURING1993-1993 SKI DOO BRP SAFARI RALLY1989-1989 SKI DOO BRP SAFARI ESCAPADE1993-1993 SKI DOO BRP FORMULA MACH II1990-1991 SKI DOO BRP NORDIK 501995-1999 SKI DOO BRP SKANDIC WIDE TRACK1988-1988 SKI DOO BRP SAFARI 5031994-1994 SKI DOO BRP SKANDIC II STL1993-1993 SKI DOO BRP FORMULA PLUS X1985-1986 SKI DOO BRP SAFARI GL1993-1993 SKI DOO BRP FORMULA MX XTC R1994-1994 SKI DOO BRP MACH I1987-1988 SKI DOO BRP STRATOS1991-1991 SKI DOO BRP FORMULA PLUS XTC E1990-1990 YAMAHA EXCITER LE1998-1999 SKI DOO BRP SKANDIC WIDE TRACK LC2005-2006 SKI DOO BRP SKANDIC SUV 550F1990-1991 SKI DOO BRP SAFARI LX2004-2004 SKI DOO BRP SKANDIC SWT 5502005-2005 SKI DOO BRP SKANDIC TUNDRA 280F2003-2007 SKI DOO BRP SKANDIC SUV1984-1984 SKI DOO BRP SS251984-1984 SKI DOO BRP SAFARI 4471994-1994 SKI DOO BRP GR