I recently bought a 1983 Enticer 17', and there were trim tab mounts on the transom(the tabs and rams were missing). Since I'm redoing the boat, I took them off. Were these installed as a factory extra? Do I need to put new ones on? The boat is powered by a Johnson 140 HP, which has an aerofoil fin on the cavitation plate. As of yet, I haven't run the boat, so I don't know how it goes through the water. Any info would be helpful....Thunder