The hood mounts are different but it is easy to make them work,as stated there is a bracket welded on from factory for the rear master cylinder and resorvoir,footpegs are different but still work depending on situation,where all the electrical goes in front under the hood is a different setup (for 03-06 electrical)all you would have to do if using your 88-02 electronics would be drill or tap some holes for the cdi,regulator etc.,As stated the about the headlight the 88-02 does not work unless you use the 88-02 steering stem.It is deffiantely worth trying to get an 03-06 if you are in need of a new frame.I'll see if I can dig up some pics of the frame differences.