I have a 01 Electra Glide Classic and love it , however in 02 Harley changed the swing arm, the frame, went to bigger rear wheel bearings and the delphi efi system if the bike is fuel injected, these were all improvements over the 99-01 models
I liked the look of the 02 and later swingarm and rear wheel I retrofitted them to my 1990 Glide! There have been several posts on HDF recently by members who have had a failure of the older swingarm - they fracture near the wheel axle.