hey guys i recentely aquired by trade a nissan nsd50a a 2 stroke 50hp outboard ser no# 10978 the power head is in great condition but my lower unit is trashed the drive shaft is twisted and the bearings and gears in the lower are trashed can you please provide any information on where i can find a used lower unit for this model? and what other model/years lower units are interchangeable with this one? and if this is worth the hassel, also i have no clue what year model this motor is any help would be greately appreciated