While we're at the 4-blade prop question - for a 191?

[1bluemcm]

Along the lines of BigMouth, thinking about having a spare around and a 4 blade makes sense.

200HP OX66 Yamaha, so am I looking for a 24P Trophy and a hub kit?

[STLBassBuster]

a 24 trophy should be a good fit for your engine/hull.