Stern Shooter rods are different in diameter than the standard Bally/Williams shooter rod
Bally/Williams shooter rod Diameter is 3/8 in dia 0.375" imperial and in metric is 9.525 mm
Stern shooter rods are 9.44 mm in dia
The main issue is with the stern shooter rod housings with the 2 bush system.
There can be a alignment issue with the second bush.
If the shooter rod does not fit from the factory it will be linished down so it will slide the the shooter rod housing