Steve, anything wrong with the plastic prop??
In order to fit something else, you would need to properly identify the style and size of fitting.
ie….4mm threaded, 5mm threaded, dog drive and if so in what size shaft. Some commercial boats have non-standard prop fittings, and these can be tricky if not impossible to replace the prop on.
BUT there are loads of bods selling props, surf for Octura props, that will get you suppliers of fast props. You will need to know the form, pitch and diameter of that currently fitted, and whether it is a hydro or sub-surface.
Ashley