One Spring Adapter Kit is required for each individual front or rear spring kit. This kit is required for High Lifter Spring installations on 2011-2014 models that have the new stamped steel spring adjustment collar instead of the old style aluminum adjustment collar.
Installation note: Remove the factory spring and slide adapter ring over the shock body. Place on top of the factory adjustment collar with raised shock centering ring facing up. Install High Lifter Spring and reassemble shock.