I now have a pair of 69 C body axles. I'm going to try and use them in the 64 full size axle housing that's in the 64 New Yorker with the 69 C roller bearings and adjuster. I think they will work all the way back to 64 open and sure-grip. But not the 63 open rear. But will work in 63 sure-grip. Because of the difference in the carrier pressure/thrust block thickness.
It's confusing, but.....
Mine 69 axles may each be about a 1/16 inch too long. That can be allowed for in the right-side adjuster, but the right axle shaft would be too far to the right, and the brakes might not like that. If that's the only problem, then I'll get an adjuster for the left side also.
If that don't work, then trimming the axles if they are too long, or using as is if they are a little short with the green bearings will.
We will see. Could be lots of flies in the butter milk here.
Don't want green, want roller.