'67 Barracuda Question

You probably would want a dual exhaust version.

I made an "edit" to my initial reply on the shape of the cut-outs on the '67 dual exhaust version.

If you are going to use tail pipes with just a "turn-down", you'd want the '67 version with the dual rounded cut-outs. If you want to use bright/chrome exhaust tips, you could use the '69 version with the rectangular cut-outs. The '69 version would also have the holes for the reverse lights.