Leaf spring bushings

The front eye bushing changed at some year model. Most evident change is the through bolt diameter, went up from 1/2 inch to 5/8. I'm going to say both 70 and 73 will have the same 5/8 I D bushings ( I've been wrong before ). You might try this for a clue... A hex nut should be 1.5 times the bolt diameter. Try a 15/16 socket on that nut under your car.