I would suggest that you use the 11&3/4" rotors & the required adapters(I'd use sliders) & some better pads & follow a bed in procedure. the larger ones are not too $$$ nor hard to come by & make a big difference in what you end with for braking. If not as said the 73-76 A body & 73-74 E body 10.87" rotors/adapters are what you need to find. EDIT the 76 (only) A body calipers have about a 5/32" larger bore than the 73-75 calipers which gives you better brake bias. The external dimentions are the same as is the price.