Re: long or short shaft
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As for shaft length, typically you have the choices below:
Short = 15"
Long = 20" (Sometimes called regular shaft)
Extra Long = 25"
XXL = 30"
The shaft length on the motor is measured from the bracket to the anit-cavitation plate on the leg. (The part where the engine sits on the transom to the first plate above your prop.)
You should use a tape measure and measure the height of your transom at the center line. The motor shaft length should be as close to or the same as this length.
Most people start with mounting the motor so that the anti-cavitation plate is directly inline with the bottom of the boat and adjust from there.