Somehow the last bolt went MIA from my Merc Alpha LX Gen II outdrive. I am referring to the bolt that would be all the way at the end of the cavitation plate that joins the upper and lower. (would be the rear most point on the boat/drive). I have the round zinc with the fin that goes on the underside, just no bolt. Anyone have a part # or at least be able to let me know what size bolt to get at the hardware store?