Duster ball joint questions.

](*,)I checked the ball joints on my 70 Duster and noticed a few things. The uppers are the small ones. Does anyone know the part #? I have manual disc brakes with the single piston caliper. The lower joints I noticed on the left (driver side) the part that connects to the tie rod has a steeper dip downward than the one on the right. I had 2 new ball joints at home from a 70 dart and the both look like the straight right side. Do I have a mix of year ball joints or are they supposed to be a different dip? Seems to me they should all be the same size to make the center link straight.