What do these leaf springs fit?

[blewbyoutobad]

I pulled these out of my 69 340 Swinger. They are original to the car but I cant find a flippin thing on this part #. Anyone have any ideas?
Thanks FABO

 

[dodge71demon]

71267 is the 10000 day calendar = December 31 1969 - 0979 is probably the mfg part number