[Ramairnacho]

Hi group I was viewing 12 bolts on internet and seen a 331 posi but listing said it was from.an ss camaro. I also learned that the ss and rs camaro had 5 rear leaf springs and z 28 and firebirds had 4. Are the perches a different depth. I asked a friend and he said they same but read on Facebook there different. How can I tell? Is code stamping the same? My other friend measured both of his and he says it should be 2 inch. But he bought his out of car. What is correct depth of perches for a pontiac formula, esprit or ta?