These U-Bolts are designed to be exact reproductions of the originals, but 1/2" longer. The added length is required when using both 5 Leaf Springs and Traction Masters or other traction bars together as stock bolts will not provide adequate thread engagement. These are not your average economy U-Bolts as they have the correct swedging to provide a flat mounting surface against the axle housing. Concours flanged mounting lock nuts are included for a factory appearance.Also fits Falcon and Cougar.