Sierra 1500 HD 2001, Crankshaft Main Bearing Set (BC409JSTD) by Enginetech. Size: Standard. The Engine Builder's Source, can locate the right part for nearly any rebuild application. Offering a full line of internal engine parts for domestic, import and high performance applications, Enginetech products are manufactured only in high quality facilities with ISO, QS & TS quality systems in place. Developed to ensure excellent performance, this product is made in accordance with the most stringent standards to meet or exceed your expectations.