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I'm pretty certain the oil pump has remained virtually unchanged for years, but I think the drive gear, and the gerotors changed somewhere in the early 2000's models.
The current Sportster oil pump should fit from 1991 to current.
There was a change to scavenge capacity in 2007 to help prevent wet sumping at high rpms.
The Buell pump has different hose connection but the oil pump is the same otherwise.
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