MerCruiser 18643A5 18-2323 Alpha One Flywheel Engine Coupler V8 4.3L 5.0L 5.7L Waterski Tow Hooks & Pylons Includes Nuts 3852648 / 3853329

Includes Nuts 3852648 / 3853329 & Washers 3852573

This is basically a complete set of 6 Mounting Nuts & 6 Washers to attach your MerCruiser outdrive to the bell housing of your boat

MerCruiser 43880-C (stamped) Gimbal Transom Housing (No integrated oil fitting provision for the drive on this) Referenced in current manuals as 43881A13

Last  pictures will give the dimensions

Many 1970s & 1980s Mercury inline outboards

MerCruiser 18643A5 18-2323 Alpha One Flywheel Engine Coupler V8 4.3L 5.0L 5.7L Waterski Tow Hooks & Pylons Includes Nuts 3852648 / 3853329MerCruiser V6 & V8 (1993 2015) Engine coupler for 14" Flywheels and engines that have a ONE piece rear main oil seal. If you have specific questions on compatibility, feel free to contact us. NEW Sierra Part Number 18 2323 *(MerCruiser 18643A5) Also found on 140hp GM 4cyl 3. 0L models with the 14" flywheel (1999 2016) This would be the A2 Model as the A5 had that tube sticking out of it which covered the yoke shaft. The A2 Model didn't have the