Who knew that Merc made two sizes of trim cylinders 15 9/16 and 16 3/16 for a A-1. I have been running a Alpha SS for some time and noticed drive could use more negative trim out of the hole.. Measured cylinder, was the longer one, 16 3/16. Question, what trim cylinder size did Merc use from the factory for the SS?

When I installed the shorter drive for the old A1, never entered my mind there were two sizes of cylinders. Searched the net but to no avail. Anybody?