858405T05 C# 858405-C1 Mercury 2004-06 Optimax Port Cylinder Head 135 150 HP. Thank you for visiting Southcentral Outboards. We are a professional business specializing in new, used, and obsolete parts. The item you are looking at is guaranteed to be described, pictured, and cross-referenced correctly. We put more time into our parts, their descriptions, and the listings than anyone in this business, and we are very good at it. Your satisfaction is important to us, and you’ll see that throughout the process of your order. Removed from freshwater engine. Lays flat – no wobble- no sign of overheating. Studs and threads in excellent condition. Nozzle in great condition. Will need new gasket. Please be absolutely sure this is the correct one for your motor prior to purchasing. Location: Southcentral Outboards, Altamont, Illinois. This most likely will not fit every model for the years and horsepowers we have listed. We urge you to make sure this is the exact item you need by matching the part number to what is required for your motor. Monday-Friday inquiries will generally be answered in 15 minutes or less. We care about our customers! Vintage Motors & Parts.