Is it at all possible a gear case assembly from a 1956 18hp FD11 would work with a 1955 10hp QD16 ?<br /><br />QD16 Gear Case 376402<br /><br />FD11 Gear Case 376844<br /><br />The 10hp Runs sweet the 18hp is missing a few important things like a recoil and bonnet ?