Sierra International  18-5656 Starter Drive Assembly The Sierra 18-5656 Starter Drive Assembly is interchangeable with the following: Arco DV374, Mercury 68575, 685753. Each Sierra product meets or exceeds the original equipment part it replaces. Sierra Starter Drive Assembly Meets or exceeds the original equipment quality Sierra part number: 18-5656 Interchangeable with the following: Arco DV374, Mercury 68575, 685753