Dart lower ball joints....

I have to agree. The upper ball joints are listed for disc and drums on the 67-72. Upper ball joints changed in 73. The lower ball joint attachés at the lower control arm and separately, to the spindle.

I just found the differnce. The disc bolts are shorter and the drum ball joint's holes are too small for the lower control arms. Wonder how hard it would be to drill them out? My ball joints are good shape and the new ones cost $90 each. The ones for the drum brakes are $130 each.