1956 Evinrude 10HP. Ignition points are getting oil soaked. Suspect upper crankshaft seal. My illustrated parts diagram (from 1956) shows part # 301967 Carbon Seal "O" Ring, and part # 302036 Bearing Seal (carbon). That should fix 'er. Can anyone give me some ideas where I might find these parts, or if they cross to a newer number??? Thanks in advance!!!