Zippers Performance Z650-039 Sprocket Shaft Spacer for Softail 03-06/Dyna 04-05Use these hardened and ground spacers when converting 2003 and later Twin Cam engine cases to a Timken output bearing. These spacers will provide correct primary chain sprocket alignment when assembling the engine with the wider Timken bearing.* Suggested Additional Purchase: 1. Timken Bearing # SS31 4013 2. Timken Shim Set # Z648 605 Fitment: Softail 2003 2006 Dyna 2004 2005 Features & Benefits: * Width = 0. 984in. * OD = 1. 750in. * ID = 1. 275in.