Those would be C14's and C15's. No C-9's.
The front of the service manual has all of that stuff. So does a restoration pack from chevrolet. Although if you don't already have one, the word is, that they now charge a fee for a new restoration pack.
Just an FYI, the lockouts are actually an option. You could order a 4x4 without the lockouts so that the front axle is always locked. Kind of like a modern 4x4. I don't know about the parts for that setup.
