This specific kit (2SBF9EW) is engineered for Full-Size Trucks equipped with a 9' Service Body and an Extended Cab (also fits 11' bodies on Single Cab trucks). It is compatible with the following heavy-duty platforms (typically 2500/3500 series and up):
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Ford: F-250, F-350, F-450, and F-550 Super Duty.
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Chevrolet/GMC: Silverado and Sierra 2500 HD, 3500 HD, 4500, and 5500 Chassis Cabs.
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RAM: 2500, 3500, 4500, and 5500 Heavy Duty Chassis Cabs.