Here's a sharper pic of my 84 Bronco, withthe Skyjacker 6" lift kit and quad front shocks:
The front, longer shock that mounts at bottom to a stud on the front of the axle beam is the primary/ main shock, just like the single front shock set-up. The shock rearward of the wheel is the helper or auxillary shock, mounted at bottom to the radius arm and shorter than the front one. I've seen some guys leave the aux shock out when they install a lift kit, and just run one front shock per wheel. Saves money for the two additional aux shocks, but makes the ride slightly different/ harsher than with both shocks per wheel. What I liked about having two shocks per wheel is when the front-lower shock stud breaks off, you still have the aux to help out. JSM84