The Kenworth W900L 8 Inch Elbow Left Side is a practical and reliable product designed to fit most Kenworth 2003 and 2006 Aerocab W900L models. With its 8 Inch to 5 Inch size and Taper-Loc Reduction on the top side, it easily accepts an 8 Inch O.D. stack. This elbow is sold individually and features a 40 Step for added convenience. Check OEM Number - M66-1270CP to ensure compatibility. Its sturdy construction and compatibility make it a beneficial addition to your Kenworth truck.