BST BSSP Body Mount Bushing Kit for 1999-2017 Ford F-250 2WD/4WD,1999-2017 Ford F-350 2WD/4WD,Part NO.KF04050BK Material:Made of high quality rubber with excellent structure and durability. It is corrosion resistant, resistant to vehicle fluids and road pollution Function:Keep the body and frame aligned correctly, effectively isolate the noise and vibration of the cab and chassis, and improve the performance and handling characteristic Attention: After installation, composite rails will be used to provide smooth operation and maintain proper alignment of fuselage and frame. Please keep the fuselage and frame aligned during installation Package Includes: come with a box---8× Upper Body Mounts； 8× Lower Body Mounts ；2× Body Mounts ；2× Washers as Shown