Most likely itís a Alpha 1 Gen 2 which also has a pitot tube built into the leading edge of the drive. The depth sounder transducer at be mounted in the engine compartment and shots through the hull. What engine do you have? You may have the option to go with Mercruiser dry joint exhaust.
1997 Silverton 362, 7.4 Crusaders
1997 2400 SCR, 5.7 Vortec / Bravo 2