1973-1980 Mercury 6437A1 Crankshaft Crankcase Top Seal bearing housing 20 hpPart Description: 1973 1980 Mercury 6437A1 Crankshaft Crankcase Top Seal Assembly 20 HP with bearing Part Number(s): 67437A1 Model(s): 1973 1980 Mercury Condition Description: Used, in good condition Retail Price: Obsolete Part Details: Crankshaft Crankcase Top Seal Assembly This should fit: 1973 1200203 CYLINDER BLOCK AND CRANKCASE ASSEMBLY 1974 1200204 CYLINDER BLOCK AND CRANKCASE ASSEMBLY 1975 1200205 CYLINDER BLOCK AND CRANKCASE ASSEMBLY 1976

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