Correct mufflers (or as close as possible) for a 1962 Olds Starfire

Hey all, my Starfire needs new exhaust. It has dual exhaust now, but I don't know if the mufflers are original. Regardless, from what I've heard getting the exhaust right is important for this car. I've heard that they had a fiberglass packed muffler. Is that true? And if so, is it still available, or what is the next closest thing to put on it? Thanks, Rick