The ARCO 30459 Inboard Starter features a permanent magnet, gear reduction, and a counter-clockwise rotation. It replaces the following part numbers: Delco 8000186, Delco 9000888, Marine Power 475118, Marine Power 0170-000, Mercury 50-808011A4, Mercury 50-808011A05, Pleasurecraft RA122009, Sierra 18-5603, Volvo 3862985, Volvo 855334, and Westerbeke 21129980. All armatures tested to withstand 50 times operation voltage (12V). All motors performance tested at 5 different load levels. All motors must meet or exceed OEM performance before being boxed.