The 2-piece one is the "improved design". I don't know that it was ever a factory product. Best is the model with polyurethane bushings (last forever). You can buy at rockauto or Autozone for ~$30/set. I once put the 1-piece type in my 69 Dart (came in PST front end kit). A pain to install and doesn't take long for the metal frame to cut into the rubber.
It looks like your cupped washer is on wrong. It should bow away from the rubber, which seems counter-intuitive. Some washers have "this side away from rubber" stamped on them. While the LCA is off, consider replacing the bushing. A cheap part. Not easy, but several posts w/ photos. Much easier if you have a shop press. And sand and paint those parts while off. Those photos of eastern cars make us west coast guys cringe. Yours looks pretty good for NC.