Leaf springs

IIRC, the part with the even number is right side, odd left.
As I said, If I remember correctly...
Visually though, they pretty easy to figure out, if they're not identical.
If they are performance springs like SS the short bottom segment faces forward on the right/passenger side. The short segment facing rearward goes on the left.
Also,either more leaves, or more arch would be right side.

To the other fellow with the Charge and Dart, I would think someone was mistaken as the right and left would remain the same for either.