AOR can supply leaf springs in a variety of custom lengths. We chose AOR's 54-inch rear leaf pack for our Toyota trail truck. The springs will mount on top of the axle in the OEM manner. The added inches (stock length is 48 inches) will let the springs flex better and comply with twisty terrain. Racing or prerunning applications can use 62-inch Orbit-Eye springs, which mount under the axle and offer maximum uptravel.