70-72 valiant lower ball joints

I'll check out the moog numbers on rock auto. My son is working at oreillys right now as a parts delivery driver. He was checking out their website and noticed the ones that they have listed for the 70-72 disc brakes look like the 73 and up cars and the pic they have listed for the 73 and cars look like the 70-72 cars. Which they say they have in stock so he's going to take his old part in and see if it matches what they are calling the 73. I am thinking that maybe the parts got entered wrong on their website catalog. Crazier things have happened.