Vehicle Compatibility: These Mile Marker 549 Locking Hubs fits 2005-2020 F250, F350, F450 and F550 4WD; keep in mind that the conversion kit is NOT required. 2005-2020 Ford F450. Built to Last: These waterproof 549 hubs are made with marine-grade stainless steel hardware and it's built to resist corrosion and water which is good for all-weather use, including harsh, salty & wet conditions.
