Upper/lower crankshaft main ball bearing.
Replaces:
OMC Stern Drive 377139
Johnson/Evinrude Outboard 377139
OMC Stern Drive 379258
Johnson/Evinrude Outboard 379258
Mercury Marine 30-63742T (alt 63742R-0030) Sport Jet
Mercury Marine 30-63742 (alt 63742-0030)
Mercury Marine 30-53853
Mercury Marine 30-20080
GLM 21860
Mallory 9-51202