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:1999-1999 ARCTIC CAT BEARCAT 440-I2007-2007 ARCTIC CAT PANTHER 660 TRAIL1996-1997 ARCTIC CAT BEARCAT 550 LC2005-2008 ARCTIC CAT BEARCAT 5701996-1997 ARCTIC CAT BEARCAT 440 FC2001-2001 ARCTIC CAT PANTHER 3702003-2003 ARCTIC CAT 4-STROKE TOURING1995-1998 ARCTIC CAT BEARCAT 4402004-2006 ARCTIC CAT T660 TOURING1995-2000 ARCTIC CAT BEARCAT 3402003-2003 ARCTIC CAT 4-STROKE TRAIL2000-2000 ARCTIC CAT PANTHER 3401995-1995 ARCTIC CAT BEARCAT 5502006-2007 ARCTIC CAT PANTHER 660 TOURING1998-2002 ARCTIC CAT BEARCAT WIDETRACK2004-2004 ARCTIC CAT BEARCAT 570 LT2000-2000 ARCTIC CAT BEARCAT 440-11999-2000 ARCTIC CAT BEARCAT 440-II