lower ball joints 65-72 kelsey hayes disc set up

C130 Chief said

Note that there is nothing special about these ball joints. With the exception of 9" drum cars ALL A-BODY LOWER BALL JOINTS ARE THE SAME.

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C130 Chief.
If you are talking about 1973-76 A body cars, then yes, lower ball joints are the same between drum brake cars, and disc brake cars, but the original poster is asking about 65-72 cars.
Then in that case lower ball joints ARE different between drum brake cars, and disc brake cars.
The difference between the two is drum brake lower ball joints attach to the spindle using 1/2 inch diameter bolts.
Disc brake lower ball joints attach to the spindle using 9/16 inch diameter bolts.
That's the difference between the two. In theory you can drill out the mounting holes on drum brake lower ball joints from 1/2 inch, to 9/16 inch to use on a disc brake set up if you wanted to.