A Body LARGE bolt pattern rear brakes

Bill, 72 down A-bodies came with 1 3/4" wide brake shoes, the later A-bodies, B bodies and C bodies came with 2.5" wide brake shoes. The axles you are looking at have an offset to work with the 2.5" wide brakes whether they are 9", 10" or 11" in diameter. Whatever drum you select you will need backing plates and the rest of the hardware to go with that size drum. The 73+ 10" a-body drums are a nice match to the 11" 73+ front disks and the drums and shores are readily available.