Need help re front suspension question

The bolts you have pictured in the photo should be the bolts you have circled in the drawing unless you are mixing / matching bolts/ spindles/ ball joints which are incompatible.

On my 67 drum spindles, one of the two holes is tapped, the other is not. It seems to me one bolt might be shorter than the other, but this may not be true on disc spindles

my drum brake bolts do NOT use cotter pins, but mechanical locking nuts just as you have in the photo