65 barracuda leafs to 74 duster?

I have a line on new 65 formula s 340 rear leafs from espo. Supposedly 6 leaf with heavy steel.

I cannot seem to find info in search function regarding if they will fit my 74 duster.

Espo said they appear to fit the dimensions and will likely have .5" higher than factory ride height.

Please let me know if you have seen these be interchangeable or not.

I found this thread which I reckon answers my question, I think:

http://www.forabodiesonly.com/mopar/showthread.php?t=152060&highlight=springs+fit