I want to replace the single exhaust muffler on my 65 "C" code fastback with a correct original. This is the long style muffler that sits sideways between the gas tank and differential. I show my car in the concours class there I need to retain complete originality and do not want an aftermarket muffler. The one on my car now shows a part number of 83-39782-7. Can anyone identify this muffler? Is this even an original? I don't see any Ford logo markings and frankly, don't know if an original muffler will have a Ford marking. Any suggestions on where to get a correct replacement? Thanks.