Ford XL3Z-14B166-AA - SWITCH ASY 1999-2004 Ford F150 F250 F350 Excursion 4x4 4WD Switch Bulb OEM XL3Z14B166AA 4x4 4WD Switch Bulb (Does Not Include Knob) F-150 F-250 Expedition Excursion Navigator XL3Z14B166AA Ford Lincoln Mercury Genuine OEM Parts