Sterndrive Engineering Alpha 1 Propshaft 6 JawFits: Mercruiser; I,R,MR Alpha I & Gen II drives; 1973 to current; Standard Right Hand Rotation; Mercury Outboard; 70-125 HP Metric Inline 3 & 4 Cylinder Engines; 6 Jaw Reverse Only (1997 and up); 3.0 liter engines; 1994 - 2005; Standard Right Hand Rotation;