Engine Coupler Triangluar for Mercruiser V6 V8 1987 up 3.0L 1990 Up 18643A5 MER18643A5

Engine Coupling or Coupler for Mercruiser Inboard Outboard applications using a 14 inch flywheel. Used on all V6 and V8 engines 1987 and newer and 3.0L engine 1990 and newer.
If you do not know what diameter your flywheel is you can look at your starter.
If you starter is held on with 1 Long and 1 Short bolt then your flywheel is 12.75 Inches in Diameter.
If you Starter is held on with 2 lonf bolts then you have the 14 Inch Flywheel which this part fits.
Replaces Mercruiser: 18643A5