power steering pump

You have the later Saginaw pump. 805moparkid shows an earlier pump, either the TRW or Federal, can't tell in that view.

One small data point. My 69 Dart's bracket broke, with cracks all over. I got another from a later slant six in the junkyard, maybe ~73. That was decades ago. It was a very different design, but fit my pump. As I recall, everything looked like in the '68 photo above (perhaps replaced?). I don't know if a generic problem, but I suggest you look for the later style bracket. 73+ cars are easier to find in the junkyard anyway.