What is the inside width of these U-Bolts?<br>Also, what is the width of the spring allowed?

3.25 I.D. fits great 3-3.25. This kit #1195 is for 2.25 wide 66-77 Bronco springs. Look at part #791195 for 3 wide springs like 73-79 F150/78-79 Bronco.