No the Kort Nozzles comes with the kit!
I haven't measured then But, I believe they are 50mm Nozzles
They are of a very good quality mode!
What I did was I purchase the Happy Hunter along with the other items needed!
I purchase the Motors from Krick!
And the Bow Thruster!
Oh, And the Fittings Kit also!
Later, I will take a picture of the contents!
BTW, A very nice kit!