I ordered one today from Steel developments, 13.75 x 17 four blader.
I will sometimes carry diving kit and lifting this all onto the plane should be easier with four blades. If it works out all right I may get one for cruising (13.75 x 19) as well as they are supposed to be smoother. I am not really interested in flat out speed, more smooth economical cruising.
I'll see what happens as it wasn't that expensive for the alloy version to try, £130 delivered.
Let me know how you get on with yours and if it is any better or worse than genuine suzuki. I ceratinly found I couldn't improve on genuine yam K props with the old boat, even using stainless..