I was afraid you'd ask. No photos, but I have another horn ring of the type that I took a photo of and attached. I remember having to trim the two screw tabs off and cut the raised cup-thingy with canceling tab off. You may not have to cut the tab off but for the combination that I had, the plastic piece was too tall to work properly. Luckily the trimmed plastic fit snuggly against the center of the metal hub. (Basically, I cut the one in my photo to more like the one in your photo)
I guess what I am saying is "yes, the E9 ring should work on a 2002 hub with some mods".
I would suggest just taking the ring off its current perch and seeing how it fits. And if it requires more cutting than you are willing to do to your OEM part, get a new one like the one in my photo and cut it up.