The Component Box For PN F17852K Front Coil Springs/Variable Rate Superseded From PN F545 Skyjacker is the perfect solution for upgrading your vehicle's suspension system. This box contains all the components you need to easily and reliably replace the stock springs with a set of greater quality, more durable ones. It includes two new front coil springs, two variable rate springs, and all the necessary hardware and instructions for easy installation. It is a great way to enhance your vehicle's performance and make it look better.