Genuine Dana axle tube dust seal fits 1998.5-2005 Ford F250 and F350 Dana 50 and 60 straight front axles. This seal is marked FORSHEDA 11
10.060 D768-11 50381.These are approx. 3.125" outside diameter, which is
smaller than the later ones. This seal goes on the axle itself right
behind the u-joint at the end of the axle tube.