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If you want a compatible performance muffler, the "Camaro" style transverse muffler is common in the aftermarket, since F-body cars used that setup. I have the Magnaflow version on my 62 F85 wagon, for example. There is also a Walker Dynomax version. They can be had in 2", 2.25", and 2.5" pipe sizes. I have Magnaflow 12265 on mine.
I'll contact Waldron today or Monday to see if they will sell just a muffler. I have everything else for my 79 blue Calais which currently has a 79 Hurst/style exhaust setup. But, the muffler is 24 years old and is tired. I have an entire single exhaust setup ready to go but I would prefer to put that into the black/silver Brougham. Not looking for noise in either of these 2 cars. The 79 H/O is different, it's got the mild imposter muffler in it from Waldron which I bought from them probably 20 years ago. It's perfect if you like a little sound, especially at 65-75 mph, no cabin drone, either.
Waldron these days seems to be the only game in town for these 79 cars. AP, Walker have long ceased making the 1 in 2 out muffler.