A Body Disc Brake Swap 101

Josh owen said
Im no smart man here, but I just removed all this from a 73 car, and I have new 73+ ball joints will they thread into the 71 UCA? I know the joint is bigger on the 73+ I'm just curious of they will screw into the 71 uppers or should I have removed the 73 uppers?
I read through and it sounds like I have to use the 73 UCA but I guess I'm just verifying I understood correctly.
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You need the ‘73+ uppers. The upper ball joint not only has a larger taper on the 73+ cars, it has a larger outer diameter. You can’t thread a 73+ upper ball joint into a ‘71 UCA.

Your alternative option is to use tapered adaptors with the ‘67-72 small upper ball joints (and your current ‘71 UCA’s). DoctorDiff sells them if you want to go that route.