Enginetech RMC403CP Engine Re-Ring Overhaul Kit for 2004-2006 GM Duramax 6.6L VIN 2Enginetech Re Ring Overhaul Kits include: full engine gasket sets; piston rings, main bearings, and rod bearings. Engine VIN code 2. O S Bore Head Gskts. Category Part # Sizes Category Part # Sizes Piston Ring Set S40568 STD, . 50, 100 Bearing Set Rod BB145J STD, . 25, . 50 Bearing Set Main BC204J STD, . 25, . 50 Thrust Washer TW204 STD Gasket Set Head GM403HS D Gasket Cylinder Head HC403L OS HC403R OS Gasket Set Lower GM403CS B