Hy puppy, in my parts book it is very complicated to figure out the correct seal as there are serial number breaks involved, so I went to my old Victor seal book. the Victor book lists two possibilities one for a non splined shaft (I assume they're talking about the outboard end of the axle)Victor p/n 49799 = National 5850, and one with a splined shaft Victor p/n 49904 = National 6358, hope that helps.
