Hearing clunks or bangs from the rear of your Ford Super Duty? These rubber leaf spring bumpers (also called insulators) can quiet things down. This set includes four bumpers that fit between the leaf springs on 1980-2015 Ford F250, F350, and F450 trucks (check your exact year). Part number E5TZ5A636A. They absorb impact and reduce metal-on-metal contact when the suspension compresses, especially when carrying heavy loads or going over bumps. Made from durable rubber, they're easy to install with basic tools. A simple, affordable fix to smooth out your ride and eliminate annoying noises. Keep your truck riding quiet and comfortable.