Direct replacement for your unit. Plug-and-play, direct fit, easy installation. No assembly required. Higher grade electric components. Improved heat sink and charging capabilities. Quality exceeds or meets the original equipment specifications. Name: Switch Box/CDI Ignition Pack Engine Position: Outboard Fuel Type: Gasoline Condition: New Part Numbers: 18-5776 114-7452A2 114-7452A3 9-25101 339-7452A2 39-7452A3 899883230 M899883230 Compatibility: Fits Mercury Mariner 18 2Cyl 1980 - Fits Mercury Mariner 20 2Cyl 1986 - 1987 Fits Mercury Mariner 25 2Cyl 1980 - 1987 Fits Mercury Mariner 35 2Cyl 1984 - 1989 Fits Mercury Mariner 40 2Cyl 1981 - 1984 Color: Black Material: Plastic + Metal Package Contents: 1 x Ignitor Switch Box Note: Light reflection and different displays may cause the color of the item in the picture to vary slightly from the real thing. Measurement allowance is +/- 1-3 cm.