Looking for Spring Offset Kit

I'm looking for a rear spring offset kit. I've got a 67 Dart that I just got a new rear for and wanted to do the offset kit when I put it in since I've got everything out and need to move the perches anyway. Hoping someone out there wants to upgrade all the way to the frame relocation and doesn't need their old offset kit anymore =P. I'd get a new one, but didn't know if anyone out there was moving up and didn't want their old one.