BAKER Drivetrains Race Grade Primary Chain Adjuster Shoes are precision-machined from virgin billet Nylon 6-6 to deliver increased strength, reduced wear, and a longer service life than the stock molded components.They are engineered as direct replacements for H-D part numbers 39976-65B, fitting 19652000 Big Twin models, and 39976-01, fitting 20012006 Big Twin models, excluding the 2006 Dyna.Withthe OEMno longer producing these parts, BAKERprovidesa U.S.-made alternative that outperformsthe stock molded partsandimported molded copies.Each adjuster shoe is built for consistent performance and long-term reliability, making it an ideal fit solution for riders who appreciate modern manufacturing quality andreal-worldtesting.