These pads run the length of the firewall on the inside of your truck. EVERY truck was equiped with a firewall pad from the factory to eliminate engine noise and hot/cold conditions coming from the engine compartment. Each pad features heavy jute padding laminated to a dense rubber or chip board depending on the application. Each pad has reproduced using the original patterns and then Die-cut for a perfect fit everytime! BROTHERS reccomends using new retainers, as old retainers are often missing or damaged by removal of old pad.