I need some help. I havea f9.9aem model serial 6gul. The lower unit is bad. Frozen as a rock. I am looking to buy an used one but my model number dont show in any books. Yamaha told me is an international number.I used it in my hunter 26 and I would hate to throw a good engine to the garbage to buy a full engine if I can repair the one I have.does any one know what will be the Part number to request it? I have seen many in ebay but dont want to end with a wrong shaft length.ChuckP