I have the Year-1 Early A HP Exhaust with resonator, Except, I took the turbo muffler (that I popped with a backfire playing on the freeway) and replaced it with a 9 degree offset round glasspack.
The resonator with the glasspack is what had been run on it for many years after the original muffler bit it. I know when mom used to takes on the freeway in it back in the 80's, it had a magnaflow glasspack.