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Firestone Coil-Rite replacement bellow 4.75 x 10 is a service part for kits PN 4108 and 4121 that restores the adjustable air helper spring used inside coil springs. It allows controlled air-pressure adjustments to alter spring rate, helping the vehicle stay level under load and improving braking effectiveness and steering balance. The bellow helps reduce bottoming out and prolongs suspension comfort when hauling.
Firestone Coil-Rite Replacement Bellow (For Kit PN 4108 / 4121) (W237606003)
