SE216 (Replaces most Mercury 3.0L) 90-216
Replaces Most Mercury 3.0L Lower Units with 13 Splines and 20,25, and 30 inch Shafts.
If you have an 8 Spline drive shaft you will need to buy the stub shaft unit and purchase an upper driveshaft from an OE dealer.
20" 45-824114A 1
25" 45-823901A 1
30" 45-824115A 1
If you have a 13 spline two piece shaft just purchase the appropriate one piece shaft from the drop down box.