Help on 1961 Chevy 4x4 parts

Guys, I know this is non-MV related other than getting this truck done so there is room to work on my green stuff at a friends shop.  We have a factory 1961 Chevy 1/2 ton 4x4 that has weird axles front and rear that we are looking for parts for.  Apparently NAPCO provided the parts to Chevy. to build this creature and we have no idea what they used.  The front end has closed knuckles much like a jeep, but of course jeep is too narrow.  I am suspect that they may be International or whatever International was using at the time.  We need at least the inner axles for the front and a new rear housing.  I know it's tempting to.swap for later stuff, but this old truck is extremely straight and the owner would like to keep it original..  If anyone has a parts truck, or any ideas it would be welcomed.

 

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