I will have to say now that I think about it the ones that were on my 67 Dart were small bolt pattern. So those were 10 inch drums, 4.25 and large upper ball joints.
Only if they were swapped from a '73 up A-body. '67-72 10" brakes were small bolt pattern, small upper ball joint.
And this goes to my point, just because someone saw something in a wrecking yard some time doesn't mean it came from the factory that way. There are two versions of factory A-body 10" drums and spindles. Up to '72 the 10" drums used a 5x4" pattern (like all A-bodies up until then), and a small upper ball joint (also, all A-bodies up until '72). In '73, the large bolt pattern was implemented on all front disk brake A-bodies, and the UCA's used the large upper ball joint just like the B/E cars did before. 73+ 10" front drum A-bodies kept the 5x4" pattern, but got the large upper ball joint arms.
So, two A-body 10" drum spindles. '72 down has an A6 inner bearing and small ball joint taper. November '72 up (73 model year) used an A17 inner bearing and has a large ball joint taper. Just like the TSB describes.
