67 68 69 Barracuda jacks whats the difference

Yeah, I never heard that they were different by year. The differences seem pretty inconsequential. Part numbers might tell the story. The Barracuda and Challenger book gives one part number for all three years, but the text is extremely vague and not really conclusive. It might be talking about the base only.

All of them are still death traps and bumper twisters...