I think in the late 80's there were still I/Os available. Sea drive models were probably history by then, and you could get a Sailfish with a bracket, Grady Drive I think they were called, or cut out transom for outbaords. Like Wahoo said go back to the Grady site and check out the yearly sales literature, kind of interesting. At some point they began to add the bracket or euro transom to the length. After I bought mine I did not really follow changes in the model although the sport bridge model when introduced had many nice features.