Pretty cool that your original shocks are stamped with numbers matching the parts book (which doesn’t show the rear shock in a diagram). The lower left and upper right text entries show front and rear numbers for the 222 (f: 56110-02702, r: 56212-02702). The 223 parts book shows # 56210-04301 for the rear shocks (different number than shown for the 222 rear). I don’t know the 320 rear numbers. I don’t know how Datsun does part numbers, so I would assume different number means different shocks. The 223 was torsion bar independent in the front like a 320, the 222 was solid beam in front. 222 shocks front and rear have studs on both ends, so no eyes. My 222 has some old Alfa Romeo rear shocks both front and rear; they are too long. They didn’t bottom out when I was driving the truck, but I know they would, so they aren’t staying on there. They would also be expensive to source; I happened to have them in my homeless possessions mental hoarding disorder shed in my back yard. Had to work that in to the story, even if it was kind of awkward. ACTUAL RELEVANT INFORMATION: the rear shocks off of early (like late ‘60s) ford mustangs are supposed to fit both front and rear on the 222. I have purchased a set of rear mustang air adjustable shocks to put on the back of my truck, but I haven’t installed them so can’t give a full report. They are short enough at minimum, but are fatter, so I have to make sure there is clearance. May or may not be worth the trouble (of air fittings, etc.), we’ll see. Please report back what you end up putting on there.