(1) 4x4 Outer Axle Thrust Washer is a direct fit for the following:

1999-2004 Ford F-250 Super Duty
1999-2004 Ford F-350 Super Duty
1999-2004 Ford F-450 Super Duty
1999-2004 Ford F-550 Super Duty

2000-2005 Ford Excursion

With 4x4 & 50 / 60 Dana Axle

Genuine Ford Part Number: F81Z-4228-BA