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I would think you could buy another complete lowerunit at one of your local meets. There should be a lot of those around. And yes the 56 unit you mentioned will interchange. One thing to check on the 56 gearcase is the condition of the brass bushing located underneath the water pump wearplate. You will need to remove the driveshaft seal to get it out. If this bushing is worn the driveshaft probably has some wear too, where the two meet. This causes the shaft not to stay centered during operation, and allows water to come in. I always replace the shift rod o ring as well,[whether it’s bad or not] anytime I service one of those for the first time. These two items are what usually leaks on these gearcases, in my experience.