69 Dart/Barracuda 340/383 tail pipe size?

I found NOS 69 tail pipes at the Michigan swap in January and gave them to Gardner Exhaust to reproduce a couple months ago to go with the NOS 383 headpipes I gave them a couple years ago. They sent me the first set of the headpipes to bolt on my car and they were excellent! Can't wait to see the mufflers and tail pipes!