These tappets have undergone extensive development to increase load, lubrication, hydraulic and life capacities Billet body Increased roller width Roller perpendicularity held to .0002". Hand-honed hydraulic unit cavity. Dynamic load capacities increased over 30%. Lubrication capacities for hydraulic unit and valve train (top end) increased 10%. Lubrication capacities for the roller, cams and cam bearings have increased 100% for increased cooling. Made in the U.S.A. Fits 17-20 M8, 99-17 Twincam, 00-21 Sportster, 09-12 XR, 00-09 Buell. Sold Each. (E7)