The way I read this is someone bought SS springs for a 68 Valiant and didn't like them so those are the springs for sale. If that's the case, yes they will fit the 76 Duster.
this is correct they are new and he had them on his car for a short time and didn't like them I'm on a no $ budget with this Duster and have to try and get some items as cheaply as possible when it won't hurt performance. Thanks for the info