That's the first thing I do when I want more information that what's on a web site.....pick the phone up.
The control arms and ball joints from '73 and up were the same whether it came with disc or drum.Many moons ago I bought both sockets from a vendor at Carlisle. I only knew there was a large and small version, not aware of a third size. The two should cover just about everything you will come across.
A bodys went to the large ball joint in 73 for disc brake cars. I think drum still used the smaller joint.
Thanks. Will add that to my notes.The control arms and ball joints from '73 and up were the same whether it came with disc or drum.