Hi I'm trying to shorten my longshaft 2006 Mariner/tohatsu 50hp 2-stroke to a short shaft! All I now need is the drive shaft (15") Can anybody help? I have been offered a complete gearbox from a 1979 Mercury/Mariner engine, Will this fit? My Engine was built in Japan not sure if that makes a difference altough some dealers say because its built in japan its not really a Mariner but a Tohatsu, Other bits from Tohatsu engines fit mine!