This Torrington full complement roller bearing is more durable as the original INA bearing and is a must for any cam change or service. Bearings are sold in sets of 2. The removal and installation of these inner cam bearings requires the use of Jims' tools ZPN 720487 and ZPN 751094 that can be found in the tool section of this catalog. Fits Twin Cam 1999-2006 with "Silent Chains".