So the one you have on the right is the older style. The one on the left is the new style (86 on, supposedly) with the pin with the ball incorrectly pounded out on it.
Not sure what's going on there. Did the PO remove the pins from the SU102 style drop link to make it fit on an earlier car? Or did you remove the pins somehow when you took them off the car?
If your sway bar has a pin on the end of the arm then it takes the early style. If it has a blade-style arm with a hole in it then it takes the later style.