I am new on to asking help,but am in a delima! I have purchased a 1970 9.6hp Chrysler Sea King tiller.There seems to be a hugh problem finding a propeller for it.It has a 2 blade on it and I was searching for a 3 blade or just a spare.The ingraveing on the prop is 8 1/4D x 8 1/4P.Every site I go...