Both of my 78's had the exhaust system replaced with aftermarket by the time I bought them. But my 79 W72(L78) is still original. I will have to take a peek at the tail pipes next time I am at the storage building. But, its a 79 so maybe its a different hanging system. I took pictures of the underside when I first bought the car, but I have an awesome filing system & it prevents me from finding things when I want them......
I just don't recall any brackets & I made the assumption the were only for hang in mufflers behind the differential. We Never stop learning things with these cars.......