Assuming you have the 73+ A-body knuckles, you just want to order the parts for a '73 Dart 318

Inner Tie Rod:ES401L
Outer Tie Rod:ES401R

Left Lower Ball Joint: K783
Right Lower Ball Joint: K781


'70 Duster 470hp 340/T56 Magnum/8 3/4 3.23 Sure-Grip