1643-9539A5 Mercury outboard complete lower unit New in the box Mercury outboard complete lower unit. Fits various years of long shaft (20” models) 35hp, 40hp, and 45hp Mercury and Mariner 2 cylinder outboards.  Including 1984 to 1989 35 hp with serial # 6445653 to OB110789 and 1986 to 1989 40 hp and 45 hp with serial #’s OC159220 to OD279349.  Same internal parts as a short shaft other than drive shaft.  Buy at a fraction of the factory list price. Part # 1643-9539A5
Suggested retail is $2,812.75
Web Special $ 325.00