NAK
NAK TC 1.250 2.000 0.500 Oil Seal 1.250X2.000X0.500
This unbranded piece is a straightforward choice for practical folks.
NAK Oil Seal, SC 3.375 X 5.000 X 0.500, Inboard (Marlow, Watson 050P741.4100B1)
You will find that Specialty Industries Co. keeps their designs updated without changing everything.