78-669 leaf springs

Wondering if someone can give me any information about these springs I have on my 73 Dart Sport. Both are marked with yellow paint "78-669."

One of them also has a marking to "ship to: ..." but I can only make out the word "MOLINE."

Wanting to know if they're SS, or HD, or just plain old regular springs. Anyway, if anyone has any info, let me know.

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