The Progressive Load Spring Kit is a practical and efficient solution for improving the suspension of your vehicle. This kit includes polyurethane bushings and all necessary hardware for easy installation. The kit fits OE parts Dayton Parts 334-1968 and Hendrickson 65902-004 (Haulmaax), making it a versatile and convenient option for a variety of vehicles. Upgrade your suspension with the Progressive Load Spring Kit for improved performance and durability on the road.