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In looking it up on Zanotti's and Chicago Harley, they are calling it the 'KIT-SPROCKET,COMP.' The Harely catalog calls it the Isolated Drive System Spocket Kit. Assume they are the same thing?
I'll second the "ride quality improvement" thing. I hadn't had a chance to put too many miles on since adding mine until yesterday. I gotta tell ya, I'm REALLY glad I did this.