Difference is in the front wheel drive speedo unit that was used on EG's until 2000 model year. Easily solveable. Here's some info I found that was posted by the guy I referred to above.robertg said:It doesn't make sense to me. If the Road King and Electra Glide have the same bearings how come the bearings don't fit 97 and older Electra Glides. I should call them and find out why.