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1-1/4" inlet / outlet diameter on this item
Item Details MerCruiser 78890T Throttle Linkage (Stamped 78890)
The Part Number for this Drive Shaft Midsection Exhaust Housing Tube is F684660-2 / 819815C / 684660-1(cast)
These have 3" exhaust tube outlets rather than the newer 4" style ones
Mercury Outboard 1963 400 450 500 40hp 45hp 50hp Rectifier 25571A2 32970A1 steering wheel 1-1/4" inlet / outlet diameterItem Details & Compatibility Removed from a 1963 Mercury 50hp 500E 4cyl (Serial Number: 1553XX8 I can't read some of the numbers) Rectifier & Bracket Assembly Might be compatible with other outboards & horsepowers from this time period. If you are unsure please contact me or consult your outboards parts manual. Notable Part Number(s) 25571A2 Rectifier Assembly >32970A1 (superseded) 25897 Rectifier Mounting Bracket Condition Notes Freshwater used parts