I have a mariner 150 magnum with the serial number 0B210555....I posted this before and someone told me it was a 1987 model but Im not 100% sure thats correct...I bought a manual that is for year 1977-1989...It listed the 1987 model as a magnum II...no where on my motor does it say magnum II....It just says magnum.....Could someone help me out here...Im needing to buy kits for the carb and water pump and don't know what to buy...