Which lower ball joint?

I'm planning to rebuild the front end of my 67 Barracuda and convert to the cobra-style disc brake kit from Doctor Diff, which I believe uses the 73-up disc brake spindles. I'm using 67-72 LCAs and QA1 UCAs.
Proforged specs 3 different lower ball joints, and I'm not sure which to use: 67 drum brakes (101-10131), 67 disc brakes (101-10347), and 73-up (101-10129). Which one do i use?