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I know if you were to put aftermarket cartridges in your both tubes you would have a much better ride than anything Harley made. Now if you can do the same from e-Bay and adapt something, I do not know and have never done it. Cartridges are much better for ride quality than the older style fork tubes. Whether you can patch something together to circumvent purchasing cartridge made for the application, I do not know. It is worth looking into. I am closely associated with and produce products with is G.M.D Computrack. One of the franchises owns Race Tech.
Look in the parts manual to see if everything else shares the same part numbers once you eliminate the cartridge stuff.
If so, you ought to be able to buy the other guts. There aren't many you'll need.
I have the '05 parts manual. If you get stuck I'll could send you a scan of the respective page(s).
I went with RaceTech springs and Gold Valves on my RK. Huge diff.
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