Hello everyone. I have a friend that has a 80s model 70 HP Merc outboard. The lower unit has gone bad. We pulled the lower unit and the part number is 1667-9010-C2. I found a another unit on ebay that has a casting number of 1667-9010-C1. Does anyone know what the difference between the C1 and C2 is? Also does anyone know of a good source to get a lower unit rebuilt on the net. Thanks
