How to ID Super Stock springs?

The springs most A body guys use are marked 002 and 003 this may not be visable if the springs have been painted or are really old. The 002-003 are different from each other. They look like they are for two differnt cars almost. The smaller leafs in the packs are made different lengths between the two springs and the arch in the springs will look different between the two when laid next to each other.

Hope that helps and doesn't just confuse you.