69 camaro l78 5 leaf ID

[camaro1]

I'm trying to understand what is correct, these are the original leaf springs that came with my car, the small leaf in the pic was mounted on the bottom before I had them re-arched. The second spring after the top spring does not have the dove tail. Is that an aftermarket helper spring? is it suppose to be there? Is the little spring at the bottom considered he 5th leaf in the stack? If you guys can straighten me out on this, very appreciated! thanks Rich