Cocktail class racer motor question

Do they use long shaft or short shaft motors? Or can you adapt for either? Thanks in advance. 

Short shaft only.

Cool, thank you. 

   If you're looking for a design class OMC motor - either 5.5 or 6 hp in running shape I have several available from $300.  These are short shaft, stock motors.

When you say "short shaft" do you mean "normal shaft" and  "not long shaft" like is used on sailboats?   Are there three lengths of lower units?