The included longer bolts and spacers (arrow) are supposed to be for pre-'99 Jeeps according to the directions. However, we ended up having to use them even though our axle was out of a '99 Jeep. Even with a kit as complete as this, pay attention to clearances and fitments before driving. While the kit even includes ball-joint cotter pins, it doesn't include tie-rod cotter pins. Fortunately, we had some on hand. Otherwise, the instructions and hardware included in the kit are very complete and easy to follow.