Rear frame rail fitment

They may fit but I don't think so there was some difference in the 66 and down, and 67 and up cars... I don't really remember alot, however I bet if you look at the FSM and went to the chassis and body section, you can look at the blueprints, and figure out if they'd work or not..Maybe. hopefully some of our more knowledgeable, heavy chassis workers will kick in on the conversation