76 Aspen Rotors

Does your 74 have factory equipped disc brakes with single piston slider calipers on the front? If the answer is yes, then these will fit your car. If it's a 74 duster with the factory discs on the front

If it is, then the rears should already be 10x2.5" drums. You can enhance the rear brake drum cooling by using the finned heavy duty drums off any RWD 84-89 diplomat, fury, or fifth ave