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Are you talking about a 2010 road king and a 2000 road king?
This page says yes.... http://www.harley-davidson.com/gma/g...bmLocale=en_US
Looks to be stock on 05 and later bikes.
Some models may need the new retainer ring.
I don't know if the newer setup would really be an upgrade though , they just look nifty , the beam pattern really isn't better than the older ones.
Mick
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