Sterndrive Mercruiser Alpha One Gen I Replacement Sterndrive Mercruiser Sterndrive Mercruiser Alpha One Gen I Sterndrive Mercruiser Alpha One Gen I Complete SEI-106 Sterndrive Mercruiser Alpha One Gen I Complete SEI-106 Upper & Lower 1.47 Ratio This is a Replacement for Mercruiser sterndrive alpha one generation I Complete, 1.47 Ratio Standard rotation will fit 1973 to 1990 www.sterndrivereplacement.com