1OE Numbers: Replacing part numbers for reference are 18?5776, 114 7452A2,114 7452A3, 9?25101, 339 7452A2, 339 7452A3, 899883230, M899883230 2Fitment: Fit For Mariner 18 Hp 2Cyl 1980?1985; Fit For Mariner 20 Hp 2Cyl 1986?1987; Fit For Mariner 25 Hp 2Cyl 1980?1987; Fit For Mariner 35 Hp 2Cyl 1984?1989; Fit For Mariner 40 Hp 2Cyl 1981?1984. 3Multi Function: Outboard Cdi box will improve throttle response, increase ignition start speed, increase spark energy, increase rev limit (increase top speed). 4Sturdy Shell: Cdi ignition module is made from resin material with durable shell, effectively helps shield and protect against harsh conditions, vibration, wear and moisture. 5Simple Operation: Cdi ignition box is simple to operate, plug in module, no cutting or splicing, no complicated operations, convenient for using.