These pads run the length of the firewall on the inside of your truck. Every truck was equipped 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 neoprene rubber. Each pad has reproduced using the original patterns and then die-cut for a perfect fit every time! Brothers recommends using new retainers, as old retainers are often missing or damaged by removal of old pad. Note: retainers are sold separately.