I believe you have Dana 44 closed knuckle. These are approx. 1960-1969. What is wrong with what you have?
http://www.truckspring.com/4x4/lockout-hubs.aspx?make=Chevrolet&year=1966&model=K10+Pickup
Be careful with these, be sure your spline count and other info is the same and call them first.
Of course there is always the donor option. Check local craigslist or pastures smile


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