1985 Bayliner Ciera 255D (Volvo Penta 5.0 GM engine rplaced with GM V8 5.7) 24 ft Cruiser Volvo Penta Outdrive .... at top of Transom Housing is a Trapezium Shaped plate held in place by two hex bolts either side and pretty much rusted through completely - can anyone please identify what this is...
