Tap it in to where its gonna be OK on the flanges bearing bit
generally on v v olde flanges, the smooth bit, wher oil seal sits, is owt but smoothe,
its all pock marked wid holes thru rust.
get the flange as claen as poss, and see where seal is gonna sit
if its gonna sit where ther aint ne damaged bit, then if it means sett,n the seal to a diff depth, then it,ll ev t,be so.
the side shafts onn diff are the same,so I tend to bung 2 seals in here, just for good measure.
Ye can doo this on yours wid the thinner seals
A double lip seal is also available