Sierra 18-55506 Outboard StarterSierra replacement outboard starter for Mercury Outboards.Features: Superior connection between the solenoid and the commutator brushes; Updated planetary gear and clutch gear spring to maximize life span and reliability; Updated solenoid design provides optimum performance by utilizing higher quality materials; New solenoid also offers an increased battery terminal length for easier installation; Seals are strategically integrated to reduce opportunities for water intrusion; Interchangeable With: Mercury Marine; 50-8M0088064; 50-8M0137769; 50-8M0166297;