I have a 93 Four Winns with a 5.8L, 360 HP connected to a King Cobra I/O drive. The splined sleeve spun leaving no splines. I need an OMC engine coupler P/N 987528 or suitable substitute. I have been scouring every on-line marine salvage site for this part. Anyone have any ideas? The boat is in excellent shape, the engine runs strong and the lower unit is excellent. The coupler, however is required! Thanks...