I'm looking to convert from the yamaha non H.O. pump with the 2" extension to a seadoo pump I already have a complete seadoo pump ready to go. I'm going to go with addicted's pump adapter that uses the 2" extension . My question is that I've seen a screw on driveshaft adapter for my existing gpr shaft but I have no clue where to get one? Any thing else I'm missing ? Thanks