olddaze,

3B is correct (as usual). The shackle pivots/pins you received look like the style that was used in earlier years (1956 and many years earlier). The 57-59 shackle pivots/pins have nuts on them and look like your old pivots/pins.

Tim
1954Advance-Design.com
1954 3106 Carryall Suburban
1954 3104 5-window pickup w/Hydra-Matic
The 216 and early 235 engines are not "splash oilers" -- this is a splash oiler.