Timbren SES (Suspension Enhancement Systems) Kits for the front end are ideal for vehicles equipped with snow plows, heavy duty bumper, grille guards, etc. By replacing the factory bump stops with the SES kit you will increase your vehicles suspension performance by reducing suspension sag and vehicle sway. Custom fit kits means most applications bolt on using factory holes in a matter of minutes. Timbren SES kits are made of Aeon Hollow Rubber that absorb shock and eliminate bottoming out on and off road. Backed by a lifetime warranty ensures you can depend on these to help your Chevy Commercial perform when you need them the most.