Direct replacement to your unit.Plugandplay, direct fit, easy installation.No assembly required.Higher grade of electric components.Improved heat sink and charging capabilities.The quality exceeds or meet the Part Number equipment.Name:Switch BoxCDI Ignition PackEngine Position: OutboardFuel Type: GasolineCondition: NewPart Number:1857761147452A21147452A39251013397452A2397452A3899883230M899883230Compatibility:Fits For Mercury Mariner 18 2Cyl 1980 Fits For Mercury Mariner 20 2Cyl 1986 1987Fits For Mercury Mariner 25 2Cyl 1980 1987Fits For Mercury Mariner 35 2Cyl 1984 1989Fits For Mercury Mariner 40 2Cyl 1981 1984Colour:blackMaterial:plastic+metalPackage Contents:1 x Ignitor Switch BoxOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +13cm.