Sierra International Alternator Conversion Kit 18-5953-1 for Mercruiser Marine Sterndrive Engines, 68A All Sierra Alternators Meet or Exceed USCG, SAE J1171 and ISO 8846 Safety Standards 100% Load Tested for Assured Reliability Out of the Box Marine Grade Containing Heavy-Duty Bearings and Regulators for a Longer Service Life Contain High Quality Stators and Heavy-Duty Rectifiers for Maximum Efficiency Before Ordering, Please Verify this is the Correct Part for your Application. For Assistance, Please Call Sierra's Tech Support at 1-877-663-8400 All Sierra parts qualify for and are covered under Sierra's Industry Leading Customer Satisfaction Warranty