Product description Brand New Power Trim Unit for Mercury Outboards. Replaces Mercury 2.5L and 3.0L Fits Mercury/Mariner 2.0, 2.4, & 2.5 Liter V6 engines. (1989 and up. OG201875 and up) Serial numbers OG201874 and below require a conversion harness and relays. Fits Mercury / Mariner 3.0 liter V6 engines. (1994 to current. OG217420 and up) Applications: Replaces Mercury Outboard part numbers: 855998A05, 855998A09, 855998A10, 855998A 3, 855998T 1, 826729T 2, 826729A 2, 826729A 6 Fits Mercury/Mariner 2.0, 2.4, & 2.5 Liter V6 engines (1989 and up. OG201875 and up) Serial numbers OG201874 and below require a conversion harness and relays. Fits Mercury / Mariner 3.0 liter V6 engines (1994 to current. OG217420 and up)