Bearings Kit of OE Number:2M4978/BC409J/BB253J/MS2199/BB253J/CB663/41859CP/MS2199P/CB663P/C96008Main & Rod Bearing Set Fitment:for Chevy 4.8L 1999-2016 Light Truckfor Chevy 5.3L 1999-2013 Car and Light Truckfor Chevy Silverado Tahoe Suburban 1999-2013for GMC Sierra Yukon 1999-2013for LS Gen III IV 4.8L 5.3L V8 engines 1999-2016, 3.78" Bore, including LM7 LR4 L59 LS4 LY2 L20 LY5 LMG LH6 LC9 L33Main Bearing and Connecting Rod Bearing Kit Specification:Type: Rod and Main Bearing Kit, Engine Crankshaft BearingMaterial: High-tin AlloyColor: Silver ToneInstallation Position: Between in the Crankshaft and the CylinderThis is a non-OEM product, accessory only!Features of Bearings Kit:Main bearing is an important bearing connecting the crankshaft and the frame, which can support the crankshaft, reduce wear and reduce noise.