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Firestone Coil-Rite replacement bellow for kit PN 4100 restores the adjustable air helper spring used inside your vehicle's coil springs. By providing a tunable air chamber, the bellow helps create a variable spring rate to level the vehicle, improve braking and handling under load, and reduce suspension fatigue. Use it to maintain ride quality and prevent bottoming out when carrying heavier cargo.
Firestone Coil-Rite Replacement Bellow (For Kit PN 4100) (W237606100)
