75 Dart - Stock Muffler O.D. and I.D. measurements? 225/6

well its not a new car by any standard you may want to do alitle measuring under the car just to be sure on lenght inlet/outlet possition and tubesizes.
i have worked with exhausts for about 10years and its almost impossible to sell the right muffler based on application on anything from the 70´s or older always best to check first :(