Other than the '54 green paint on the '57 maroon paint, I think it still may work, but I'm not as familiar with the exact lower unit and drive shaft details of the QD-15 as I am of the QD-17. I think the only difference is the paint color, but maybe someone else can chime in and confirm.
Ya , it's Qd 15 , 1954 10hp, do you know if it I'll fit on my 18hp,? I didn't by it yet or else I would be able to tell , just wanted to make sure before I bought it , thanks