Big bolt pattern and disk brake conversion

Professor Fate said
I've heard that, too- but have never actually seen a big ball joint drum A body in the flesh. A few small ball joint drum cars (small bolt circle). They may exist, but until I actually see one I'll stick with what I know so far. Either way, the spindle isn't going to work for him.
Again, the parts are all different for a disc setup! (except the lca)

Here is an UCA I know came off my ‘74 Duster with disk brake spindles. The spindle is a ‘73 drum brake spindle off my '73 Duster project car. Fits together well, UBJ is the same.

Funny thing is, I have the drum brake spindle because we converted the ‘73 to disks back when the car was my son’s. And I am almost certain we didn’t change the UCA’s when we did it. I know I had to do a LBJ, but only because I mushroomed the stub. So even the LBJ should be the same disk to drum.

So now you have seen a big ball joint A-Body drum spindle.