You probably need to verify these numbers for yourself.
NOTE: Due to a recall certain 2003 model drifters (and other vulcans) required a modified oil filter setup. See Bulletin .
The following is the Kawasaki part number for the kit needed to replace the filter on these bikes.
*1) K&N indicates 1999-2002 Drifter 800's should use KN-303 or 303C.
These are the same size/specs as the 204, excepting the relief valve pressure is 18.13psi vs 14.5psi on the 204 and KN-303 is 3.346in(85mm) in height, vs 2.953(75mm) on the KN-204.